As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MASTER CAUTION RECALL, RT PACK LIGHT ILLUMINATED. THE LIGHT EXTINGUISHES WHEN MASTER CAUTION SYS IS RESET. ACFT GROUNDED. BITE TEST OF NR 2 TEMP CONTROL VALVE HAS FAULT. CLEARED FAULT AND RAN RT PACK. NO FAULTS. LIGHT STAYED OFF, REF FIM 21-53-00-810-804.