What was found
AIRCRAFT RETURNED TO PLATFORM BECAUSE AFTER LT ENGINE STARTED PARAMETERS WERE N2 70 PERCENT, EGT 422 DEGREES, N1 42 PERCENT, EPR 1.10 AND 21 °C. DURING CHECK, IDLE SOLENOID WAS REPLACED IAW MM 73-20-05, TEST CORRECT. DURING TAXING, SYSTEM FAILED AGAIN RETURNING TO PLATFORM. TECHNICAL PERSONNEL DEFERRED THE FAILURE IAW MEL 73-7.