Not sure if this is applicable to your situation, but I just repaired a
different brand radio with similar issues that had controls in the mike. There
was a small 8 pin connector on the board in the radio from the mike cable that
had broken loose from the PCB. I wrapped a small wire around the end of my
soldering iron, put a couple pairs of reading glasses on, (bad eyes),
resoldered the connector, and have a happy customer.