What was found
AIRCRAFT RETURNED TO PLATFORM AFTER ENGINES STARTED WITH CROSSED FEEDING, EICAS MESSAGES R HYD R SUR PRESS, R ENG REV CONE, L ENG REV CONE, L ENG FIRE LOOP 2, EPR DET LOOP 2 INCHES AND (RT ENGINE EPR OUT OF SERVICE) WERE SHOWN AND PNEUMATIC AUXILIARY POWER UNIT FAIL. THE ENGINES WERE TURNED OFF AND FIM 71-00-00 FIGURE 110, SHEET 1, CODE 352-17 AND 352-15 PROCEDURES WERE PERFORMED AND ENGINES WERE RESTARTED IAW MM 71-00-00, TESTED CORRECT. DURING OVERNIGHT SERVICE, THE SURGE CONTROL VALVE OF AUXILIARY POWER UNIT WAS REPLACED IAW MM 49-53-01, TESTED CORRECT.