Shower Tri Slide Missing Roller

[Freebirds]

On September 5, we celebrated one year of full timing in our Champagne and have enjoyed every minute. Except one - one of the shower doors has lost a roller so we cannot move two of the doors. We can slide one door but are a little afraid that it might lose a roller also so we don't slide it. I added a shower curtain temporarily but we hate having it in there. The dealer has replaced a roller twice before but now we are far from them.

Is there a way we can replace the roller ourselves. My DH admits he is not handy with tools so this would need to be a fairly easy fix.

(BTW, I searched the forum to see if this had been addressed but it came up with about 400 entries that seemed to relate to "doors". I'm sorry if this has been addressed previously.)