As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ILLUMINATION OF THE RIGHT "PACK" LIGHT DURING MASTER CAUTION RECALL "PACK" LIGHT EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. GROUNDED - YES. PERFORMED PTC BITE PROCEDURE ON #2 PZTC. TCV ON #2 PACK PREVIOUSLY. FAULT RESET AND R/H PACK TRIP LIGHT OFF. REF B737-900 FIM 21-62 TASK 801. RAN APU WITH BOTH PACK ON HIGH. NO FAULTS. OPS CHECK GOOD. GROUND VERIFICATION TEST GOOD.