As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT/EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. PERFORMED #2 PFTC BITE TEST/FAULT REVIEW. FOUND MAINT MSG. 21-51267 & 21-51264 TCV MAINT MSGS. NO EXISTING FAULTS. GROUND TESTED NUMEROUS TIMES WITH NO FAULTS. OPS CKS GOOD. REF B737-900 FIM 21-62 TASK 874. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.