What was found
PACK L, OVERHEAT AT LEFT PACK OUTLET OR LEFT PACK COMPRESSOR OUTLET OR LEFT PACK FLOW CONTROL VALVES (FCV) ARE CLOSED DUE TO: FCVS FAILED CLOSED, FCVS LATCHED CLOSED BY CABIN TEMP CONTROLLER (CTC) BECAUSE OF FAULT, OVERHEAT, OR PACK CONTROL SWITCH COMMANDED OFF, OR NO PNEUMATIC AIR AVAILABLE TO PACK. ADVISORY CREW COMMENTS: CHRONIC PACK L MSG-2125502 INACTV ER INTER MSG-2125502 INACTV ER INTER. INSTALLED SERVICEABLE TURBINE BYPASS VALVE PER MM & TESTED ON MAT, OPS CHECK GOOD.