As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS R PACK OFF. RAN C-L. PACK RETURNED TO NORM OPS. THEN PROB REOCCURRED. ACCOMPLISHED TROUBLESHOOTING. NO FAULTS ON PACK TEMP CONTROLLER. PACK INOP ON GROUND. SUSPECT FLOW CONTROL VALVE FLOW CONTROL VALVE LOCKED. REPLACED RT FLOW CONTROL VALVE, TESTED OKAY.