MECHANIC IS INFORMED THAT AN IMPROPER DOCUMENTATION ISSUE AROSE BECAUSE HE DID NOT FOLLOW PROCEDURES WHEN HE INSTALLED AN AUTOPILOT LH MODE SELECT PANEL IN THEIR B757-200 BORROWED FROM ANOTHER CARRIER.

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THE EVENT HAPPENED JUST BEFORE DEP; PAX BOARDED. FLT CREW CALLED MAINT FOR A POPPED CIRCUIT BREAKER FOR THE L-HAND MODE SELECT. I THEN PROCEEDED TO ACFT; ATTEMPTED CIRCUIT BREAKER RESET -- NO HELP. I THEN CONTACTED MAINT CTL FOR ASSISTANCE AND TO INFORM THEM OF THE SITUATION. MAINT CTL FOUND PART NUMBER WHICH I USED TO SEE IF THE PART WAS AVAILABLE HERE -- IT WASN'T. MAINT CTL THEN CONTACTED ACFT ON GND DESK TO START A PART OUT OF ZZZ1 STORES. THE MGR ON DUTY WAS THEN CALLED TO TAKE ACFT OTS AWAITING PARTS. ALSO; WHILE TALKING TO THE MAINT OPS; WE ASKED HIM TO SEE IF THE ACFT ON GND DESK COULD CHK LOCALLY FOR PARTS HERE AT ZZZ. IT WAS PROBABLY ABOUT 15 MINS THAT PASSED AND WE RECEIVED A CALL FROM MAINT CTL THAT AIRLINE HAD AN AUTOPLT MODE SELECT PANEL AND OUR STORES PERSON PROCEEDED TO GET THE PART. AFTER WE RECEIVED THE PANEL; I INSTALLED AND PERFORMED AN MCDP LAND 40 TEST. I REALIZED THIS WAS AN AUTOLAND QUALIFICATION ITEM; SO I PULLED MY TRAINING RECORDS TO MAKE SURE MY AUTOLAND QUALIFICATIONS WERE CURRENT. THEY WERE; AND I PROCEEDED TO SIGN THE LOGBOOK. SUGGESTED RESOLUTION: I PLAN ON REVIEWING MY AUTOLAND QUALIFICATIONS TRAINING COURSE AND BORROWED PART TRAINING COURSE. CONTRIBUTING FACTORS: IMPROPER DOCUMENTATION. DID NOT FOLLOW PROC FOR BORROWED PART. I DID CHK TO SEE MY AUTOLAND QUALIFICATIONS WERE CURRENT.