As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK OFF LIGHT REMAINS ILLUMINATED WITH PACK SELECTED IN AUTO. ACCOMPLISHED FIM 21-51; FOUND LEFT ACM STUCK AND FROZEN. REPLACED ACM IAW AMM 21-51-03. DURING OPS CHECK OF ACM, CONTROL VALVE WAS INTERMITTENT. DURING ACM OPS CHECK FOUND LEFT FLOW CONTROL VALVE INOPERATIVE. R & R LT FLOW CONTROL VALVE IAW AMM 21-51-004/404-001/012; LT PACK OPERATES NORMAL; LT ACM OPS CHECKED OK