What was found
AIRCRAFT WAS GROUNDED. PHL-AMS RETURNING TO PHL ACCOUNT ENGINE TRUST ASYMMETRY ISSUE. EMERGENCY DECLARED. AT FL 35.0 PILOT REPORTS LEFT ENGINE LOW POWER DUE TO HIGH EPR. LEFT HAND ENGINE EPR: 1.96, N1: 74.4, EGT: 474, N2: 74, N3: 77, F/F: 2.6. R/H ENG EPR:1.76, N1: 95.5, EGT: 648, N2: 88, N3: 86, F/F 5.4, TROUBLESHOOTING IN PROGRESS. REPLACED EPR TRANSMITTER HOSE AND 3-WAY VALVE PER AMM 77-11-01. (SEE NON-ROUTINE MIC 20558640 FOR CHAFED TRANSMITTER HOSE, REPLACED PER AMM 77-11-01 AND 20558642 FOR LEAKING 3-WAY ADAPTER TUBE AND VALVE ASSEMBLY REPLACED PER AMM 77-11-00-735-019-R00. PERFORMED P1 SYSTEM PRESSURE TEST PER CARD #4227.) POWER ASSURANCE CHECK OK PER 71-00-00.