What was found
ON CLIMB FROM 10,000 TO 38,000 AIR COND PACK DIFFERENTIAL EXCEEDED 20 PSI ENG NR 1 N1 = 98.8 ENG NR 2 N1=98.8. LEFT PACK 45 PSI/ RT PACK 23 PSI AT LEVEL OFF 38 000 NR 1 N1=86.6 NR 2 N1 = 86.5 LEFT PACK 25 PSI AT TOP OF DESCENT LEFT = 40.3 RT N1 =40.7 LEFT PAK = 20 RT PAK =20. ACCOMP ENGINE NR 2 BLEED AIR SYS HLTH CHECK REF AMM 36 11 00 700 801. NO DEFECTS NOTED. REPLACED NR 2 ENGINE PRECOOLER SENSOR REF AMM 36 12 03 LEAK CHECK GOOD. REPLACED NR 2 ENGINE 450FT THERMOSTAT REF AMM 36 11 05 LEAK CHECK GOOD. ACCOMP ENG BLEED AIR OPS TEST PER AMM 36 11 00 710 801, ALL INDICATIONS NORMAL.