08 transmission issue.

recently purchased an 08 rzr.overall machine is in good condition has less than 1500 miles on it.
my problem is the shift isnt working right.after much research I believe the detent balls.springs are the problem.I’ve changed the fluid and tried several tricks I’ve read about and haven’t found any detent balls floating loose.

Can I remove only the outside bolts- black.silver without dropping the balls in the trans.
I’ve read the many simply remove them altogether. Also I found where some just run one on the inside.

what is everyones opinion on this issue. where can I find the replacement balls and springs if necessary.