As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FL310, MAIN CARGO DOOR LIGHT ILLUMINATED. THE CREW RETURNED TO DEPARTURE WITHOUT INCIDENT. FOUND SWITCH S9022 OUT OF TOLERANCE. ADJUSTED SWITCH IAW AMM 52-71-09. DOOR LIGHTS AND SWITCHES OP CHECKED GOOD. DEPRESSURIZED ACFT. PREFORMED OPS CHECKED AND TESTED DOOR AND SWITCHES IAW AMM 52-30-00. OPS CHECKED GOOD. ACFT WAS RETURNED TO SERVICE.