After warranty it will be completely up to protek to repair for free or offer a refund. Maybe there is a defect I am not sure? did not hear of any recalls.

Of course they will likely take it to repair or replace at a price or a discount replacement.

I don’t think a new gear set will fx the centering issue.

another thing to try is feel the servo as you slowly move it thru the Full swing back and forth feeling for bumps or weird slight vibration or grumbles. Slowly move it full swing off and fill us in on how smooth the non-powered action is.