As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HAND PACK LIGHT ON AFTER RECALL CHECK AFTER ENG START. GROUNDED - YES. PERFORMED PACK TEMP CONTROL BITE, STBY OTHER PACK TCV LIGHT ON. REPLACED VALVE STANDBY PACK IN REF TO B737-900 AMM 21-51-11. POST INSTALL BITE INDICATED L/H TRIM AIR VALVE FAULT. REPLACED L/H TRIM AIR VALVE IN REF TO AMM 21-51-10 OPS AND LEAK CHECK GOOD.