As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: LEFT THRUST REVERSER WOULD NOT DEPLOY. CORRECTIVE ACTION: REPLACED HIGH PRESSURE CONTROLLER IAW AMM 36-11-08 OP CHECKED GOOD. THE INITIAL SQUAWK WAS NON-ETOPS SS ON LG PAGE B047993 P1 ON FLIGHT 811 AND WAS DEFERRED. IT BECAME ETOPS SIGNIFICANT SYSTEM UPON DISCOVERING THE CONTROLLER BAD.