This is strange… my earlier response not appearing. Anyway, the scenario is as below.
The pot is indeed dirty. It was measure 1.445 kOhm and goes to no connection or high resistant when I turn them. The other pot was okay. After cleaning now bot measures 8 to 17 at minimum and at max is about 1 kOhm.
Now just finished cleaning and about the instal them.
TWB, yes I did swap the power cable.
Will report back.
Cheers!