As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT A/C PACK LIGHT ILLUMINATES AFTER ENGINE START WITH RECALL. THE A/C PACK LIGHT RESETS WITH MASTER CAUTION. ACFT GROUNDED. NR 2 PZTC BITE PREVIOUS FLIGHT SHOWS THIS PACK TCV FAULT. REMOVED AND REPLACED RT PACK TCV IAW AMM 21-51-10. VALVE LEAKS CHECKED OK. NR 2 PZTC BITE STILL SHOWS TCV FAULTS 2 OUT OF 3 VERIFY BITE CHECKS. REMOVED AND REPLACED THE NR 2 PZTC IAW AMM 21-61-20. NR 2 PZTC BITE TESTED GOOD AND RIGHT PACK OPS CHECKED NORMAL ON GROUND.