Cobra 142 GTL swr/mod meter

Hello everyone, I have a 142gtl that is almost pristine. I just changed all the electrolytic caps and she talks and sounds great. The only problem I have not been able to track down is the swr/mod meter not working as it should. It will not go all the way over to the cal position when turning the pot so you can check the swr, and the mod . part of it will work in AM, but no movement in SSB.
Do I have a bad meter? Or maybe a bad mod/cal/swr switch? I do not understand why modulation will...

Cobra 142 GTL swr/mod meter