Studio Color cmy belts

I have a couple of Studio Color 575 (aprox 3 yrs old) that operate normaly most of the time, but when I give them a fast color chase the magenta wheel gets out of sync. If I keep things slow the wheel acts normally. I can also home the offending fixtures and they will sync back up. Do I need to replace the cmy belts? What is the procedure for replacing them?
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