As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING BITE OF PZTC REF L/P 60409914, FOUND #1 PZTC ZONE LT HARD FAIL ON VERIFY BIT, WOULD NOT RESET. AFT CABIN TRIM VALVE HARD FAULT. GROUNDED - YES. RAN PACKS AND VERIFIED AFT ZONE TEMP RESPONDED TO TEMP CONTROL SELECTION. AIR COND ON 6 PACK OPERATES NML, NO ASSOCIATED P5 ZONE LTS ILLUMINATED. RAN PZTC ON #1 AND #2 REF FIM 21-62 TASK 801 SEVERAL TIMES WITH NO FURTHER FAULTS, OPS CKS NML.