First Officer reported heavier than normal elevator force was required to control the aircraft after maintenance. The aircraft was returned to maintenance post flight for repair.

Narrative

The crew before me had a vibration in the elevator that got worse over time. They talked to our MX (maintenance) team who decided that they believe they needed to replace a bearing that is wearing. The aircraft was down for a day and I showed up to our aircraft and the aircraft was written back up to service from the mechanic who worked on it. He did not replace the bearing but instead made an adjustment to the push pull rod that he said fixed the problem and wrote the plane back to service. When we were taxiing out I did the elevator control check and it felt heavier than normal and I brought it up to my Captain who felt it as well and we decided it was probably the heavy tailwind we had on taxi out that was pushing on the elevator. The beginning of the flight seemed normal and in the air our vibration was gone; but on the descent the controls felt very heavy; especially on the approach. The Captain was flying and gave the controls over to me on final so I could feel how heavy the aircraft was and it took excessive force to move it. He landed the aircraft without incident but on the ground the controls still felt heavy. We tested the controls with a scale and it took 11 lbs of force to get the elevator to move which is much higher than what it is supposed to be. A local team looked at the aircraft and found that the bearings are probably worn and the fix that was done the day before over compensated for the worn out bearing causing the controls to have too much friction putting the controls out of the tolerance.