As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CARGO DOOR EICAS RAN QRH , INDICATION EXTINGUISHED ONCE WE DESCENDED AND DEPRESSURIZED TO 9000FOOT CABIN , LANDED WITHOUT ISSUE. EMERGENCY DECLARED. FIM: 52-90-18-00 FOUND DEBRIS BLOCKING MAIN CARGO DOOR CLOSED & LOCKED SENSORS. REMOVED DEBRIS PER ABOVE REF. MCD WARNING SYS TESTS GOOD PER AMM 52-71-09-2. BITE PSEU PER FIM 32-09 F103. NO FAULTS FOUND. OK FOR SERVICE.