What was found
TOPPING CIRCUIT ON LT PACK FAILED. SINGLE PACK OPERATION & LT PACK SHUTDOWN DUE TO OVER TEMP & HEAT. RUNNING IN AUTO AT FL 250, PRESSURIZATION FLOW LIGHT CAME ON, SUPPLY TEMP SHOWED 158 DEGREES & PACK RETURNED AFTER COOL DOWN & DESCENT TO 14,000 FEE. PRESSURIZED LT PACK FOR 20 MINUTES WITH SELECTOR IN AUTO. MANUAL COOL & MANUAL HOT POSITION, OPERATIONS CHECK NORMAL IAW MM 21-00-00. THE ACFT WAS GNDED.