As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE SCHEDULED MAINTENANCE THE EMERGENCY EXT DOOR 4C DID NOT OPEN PROPERLY. MAINTENANCE LUBED THE LATCH MECHANICAL SHAFT, RE-INSTALLED THE DOOR IAW MM 52-20-00 STEPS A-C FOR REMOVAL AND INSTALLATION AND IAW 52-20-01 STEP D FOR LUBING. NO RIGGING WAS REQUIRED. OPERATIONAL CHECK OF THE DOOR WAS GOOD.