As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT PACK LIGHT ILLUMINATED WHILE TAXIING FOR TAKE OFF. QRH COMPLETED WITH, LIGHT STAYED ON. ACFT GROUNDED. TEMP CONTROL VALVE FAULT ON NR 2 TEMP CONTROLLER RIGHT PACK. BITE SHOWS ZONE FAULT ON NR 2 TEMP CONTROLLER IAW AMM 21-61-00. REMOVED & REPLACED TEMP CONTROL VALVE IAW AMM 21-51-10. REMOVED & REPLACED FWD ZONE TRIM VALVE IAW AMM 21-61-21. BONDING CHECK IAW AMM 21-61-00 OPS TEST NORMAL. LEAK CHECKED GOOD. ETOPS SIGNIFICANT SYSTEM, GOOD VERIFICATION SUCCESSFUL.