As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 360 CABIN ALT WENT ABOVE 10000 ACCOMPANIED BY AURAL WARNING MASTER CAUTION AND AN EICAS MESSAGE, NO OTHER ASSOCIATED EQUIPMENT FAILURES WERE INDICATED. CREW ACCOMPLISHED THE QRC QRH DID AN EMERGENCY DESCENT AND PROCEEDED DIRECT TO MEM. BELOW 10000 FEET THE SYSTEM REGAINED CONTROL AND REPRESSURIZED TO A NORMAL CABIN. FOUND RADIAL PLAY IN ACTUATOR CRANK. REMOVED AND REPLACED CABIN PRESSURE OUTFLOW VALVE ACTUATOR.