Check the long resistor packages on the 9-88 & 9-89 modules.
They get cold joints. May be flickering & brite problem.
Be shure the chromatic switch isnt noisy by wiggling it.
Cant see the tuner (s) so pull it/them out. Resolder under the
connectors. Also there is usually a tuner control module,
check the PC there. Clean AFC switch. The tuning pots sometimes
get noisy too.
Audio is probably a bad control especially if its a slider. Try
other cleaners. WD40 can work miracles.
73 Zeno
