Maintenance Technician reported after replacing a defective part the technician felt uncomfortable with management wanting them to sign off job as complete when the technician only updated the log page with their findings.

Narrative

In ZZZ I was told that the aircraft Boeing 767-300 was going to the Hangar it was out of service for sparks in the overhead flight deck. I was directed to complete the overweight landing check I completed the overweight landing check; but during the overweight check I found evidence of a bird strike contacted my lead and contacted ZZZ line maintenance control to send out authorities to collect evidence of a bird strike; once complied with; then I accomplished the bird strike inspection and cleaned the area. I was also told to Take a quick look at the overhead it's an avionics aircraft they are going to do wiring checks because of the nature of the incident. I also checked all aircraft circuit breakers to see if any were tripped none found tripped .I turn all the power off on the aircraft and dropped down the overhead panel to the overhead door entry because that's what the pilot stated in the write up where the sparks were coming from; I didn't see any damage to the panel. I dropped the panel next to it ; it's the landing light anti-collision light ASSY then I proceeded to look at the wires to the anti-collision ;landing light ASSY looking for bare wires or anything welded together no defects found on wires ; with the panels down I powered the aircraft and performed visual of door entry overhead panel no defects found ;then performed visual of overhead anticollision and landing assy found a black mark on panel at about the 12oclock position then I grabbed the assy to take a closer look at the panel ;then sparks started coming from back of assy I immediately killed power to aircraft then pulled associated circuit breakers. I disconnected cannon plugs and looked at back of assy found jam nut to nose gear light switch completely backed out and you can flex the switch left to right to make contact with metal post on ASSY causing sparking situation. I Looked up replacement parts via IPC removed and replaced part notified supervisor and lead of findings. Performed ops check of anticollision; landing light ASSY and associated switches performed door entry overhead ops check and window heat ops checks per the A.M.M. all checks where good .I updated log page with work complied with. The shift manager told me to sign off the write up . I felt threaten ; pressured to sign off the aircraft I feel like I'm working in a hostile work environment and this goes against our values I thought my Identification cards where going to get pulled and I was going to be fired because I requested avionics support to sign off the write up. I explained to the shift manager that avionics needs to do a complete wiring check of the overhead panel and associated wiring explained to the shift manager that the aircraft should be out of service and going to the hangar to complete these tasks . He told me several more times to just sign it off; Because the part that I replaced was the smoking gun" I continue to ask the shift manager to send over the avionics crew to go to the next phase of these tasks. After several hours of going back and forth with the shift manger The avionics supervisor showed up with an attitude speaking in a loud voice asking for me when he entered the shop; then proceeded to argue with me and was condescending and disrespectful he told me he was not going to sign off the aircraft and was reluctant in doing the wiring checks. It was the end of my shift; so I started cleaning up and updated my log page with my findings."