As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VOLUME CONTROL IS NOT LINEAR AND DISPLAY FLASHES ON AND OFF. COULD NOT DUPLICATE PROBLEM. TESTED UNIT AND FOUND TRANSFER SWITCH BAD. REPLACED SWITCH S102 P/N 031-0399-01. REPAIRED. ALSO PERFORMED HEADER MOD. REPLACED HEADER P201 P/N 030-2368-16. TOUCHED UP FACEPLATE AND CHECKED LIGHTING. BENCH CHECKGOOD.