What was found
#1 ENGINE COMPRESSOR STALLED @ FL280. NO EXCEEDANCES NOTED; ALL ENGINE PARAMETERS NORMAL. #1 ENGINE STABALIZED AT LOWER ALTITUDE. / [01] PERFORMED FIM 71-05-00 TASK 805 TO STEP E6 AND AMM 71-00-00-210-801-FOO UP TO D 4 C.;[02] WORK VERIFIED.;[03] PERFORMED FILM 71-05-00 TASK 805. DURING INSPECTION FOUND FUEL OIL HEAT EXCHANGER LEAKING. REMOVED AND REPLACED PER AMM 79-21-10 PER ENGINEERING REQUEST REMOVED AND REPLACED HMU AND FUEL PUMP PER MT 773-21-10 OPS CKS AND LEAK CHECKS NORMAL. ACCOMPLISHED BORESCOPE OF # 1 ENGINE PER AMM 71-00-00-210-801-F00 REFERENCE TTG8Q00CGDMB;[04] WORK VERIFIED.