Bobcat 335 cluncking swing and weak.

I am the original owner of the machine when we first got it every once in awhile it would stop when you went to swing like something got jammed in between the pinion and ring gearthen at about 2000 hours the swing motor and/orcarrier seal started to leak. I took it to a dealer to get fixed supposedly they fixed the carrier and put new bearings and seals in it.500 hours later it is leaking again and when you go to swing it clunks/chugs. It was clunking before I took it to the dealer. I took the inspection cover off the bottom and took a pry bar to the pinion gear it does not seem to have any horizontal play is it possible that the bearings in the swing motor is shot and that is why I am gettin Clunking when I swing?