As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK INOP IN AUTO, OK IN STANDBY, LT PACK TEMP CONT FAULTED RAM INLET ACTUATOR & TEMP CONTROL VALVE. TRIED NEW PACK CONTROLLER AND STILL FAULTS RAM INLET ACT AND TEMP CONTROL VALVE. REPLACED LT TEMP CONTROL VALVE. RAN LT PACK IN AUTO. OPS CHECKS GOOD. NO MSGS. LT PACK SECONDARY HEAT EXCHANGER HAS 8.6 INCH CRACK AT UPPER SEAM. REPLACED HEAT EXCHANGER. NO LEAKS NOTED.