As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK, LEFT PACK 0 TO 5 PSI PRESSURE. CREW RETURNED TO GATE (BTB). L PACK PLACED ON MEL 21-51-1-1, MX PROCEDURES C/W. A/C RETURNED TO SERVICE. REMOVED AND REPLACED LH PRSOV IAW AMM 36-11-09, LEAK CHECK AND OPS CHECK GOOD. PERFORMED ENGINE RUNS IAW AMM 71-00-00, LEFT ENGINE DUCT PRESSURE NORMAL AT ALL THRUST SETTINGS. THIS CLEARS DI 76906. PLACARDS REMOVED. MEL REACTIVATION C/W. A/C REMAINS NO ETOPS AND RETURNED TO SERVICE.