As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONICS LIGHT, CHIME CAME ON PASSING 10000, EXECUTED TURNBACK TO KSMP BURN TO MAX LNDG WEIGHT. FOUND AVIONICS DOOR FLUSH TO FUSELAGE AND DOOR LATCH APPROX 1/8 INCH DOWN. ON INSPECTION FOUND DOOR LOCKED SWITCH WITH BROKEN SAFETY WIRE/ RETIGHTENED. SWITCH OPS NORMAL PER A300 MM REF 52-41-14-5. DOOR VERIFIED CLOSED ON DEPARTURE WITH NO LIGHT.