What was found
LOST LT PACK AT 35,000, CABIN DEPRESSURIZED, DEPLOYED MASKS. SUSPECT TURBINE IN TRIP. REF 6671-03 AND 6671-08, SAME CONDITION. PACK TEMP WAS ABOVE 85 DEG C. ALSO, NOTABLE FLOOR VIBRATION INDICATED. DESCENDED TO 31,000 RE-INSTATED L-PACK AND OPENED COOLING DOOR 20 PERCENT. DEFERRED PER MEL 21-38 CAT 'C', DMI NR 807031, PLACARD INSTALLED. CLOSED 7/3/98 REPLACED SEAL BETWEEN PRIMARY HEAT EXCHANGER AND FUSELAGE, NO LEAKS NOTED. CHECKS NORMAL PER MM 21-54-0. THIS CLEARS MEL NR 807031, PLACARD REMOVED.