Well, the switches are not sitting in their detent when pushed in other than the power button. They are working as momentary contact switches. Im no expert on these amps. Does the colored covers have something to do with them not sticking in their detent position when pushed in ?Not really sure why Texas star stuff is getting like it is. Its not like some high quality gear we're dealing with but new 667's are $1000...
If i were you bevis id spend the $22 bucks for the ebay set and call it good.