As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5803 R CTR ENTRY DOOR EICAS MESSAGE DISPLAYED AFTER LANDING. CORRECTIVE ACTION: REMOVED PLUNGER COVER AT 2R DOOR. FOUND TARGET LOOSE ON THREADED PLUNGER ROD. JAM NUT WAS BACKED OFF. TIGHTENED JAM NUT ONTO TARGET. OPERATED DOOR SEVERAL TIMES, OPS NORMAL. CHECKED CLEARANCES REF. B757 AMM 52-71. REINSTALLED COVER. 2R DOOR OK. (7516122)