any know how to repair the the on/off volume control module for a nakamaichi on 1995 Lexus SC400

radio in the lexus sc400...the vol/ on/ off module plugs into the head set.. the head set is good and amp is good,, there is an issue with the on/off/vol control itself.... if not, possibly looking to purchase a rebuilt / new one...

Asked by for the 1995 Lexus SC400