As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 330, CARGO DOOR EICAS MESSAGE DISPLAYED WITH AURAL WARNING ACCOMPLISHED AOM PROCEDURE AND RETURNED TO DEPARTURE. PERFORMED BITE & HISTORY CHECK OF PSEU IAW FIM 32-09-03 FIG 103. HISTORY SHOWED S892, MAIN CARGO DOOR LOCKED SWITCH. SWITCH IS CLEAN AND WITHIN GAP SPECS OF.070-.130. REPLACED S892 DOOR LOCKED SWITCH IAW MM 52-71-09. OPS CHECKED GOOD.