What was found
EMERGENCY DECLARED, L AFT FUEL PUMP PRESS, R FWD FUEL PUMP PRESS, EQP COOLING OVHT, PROBE HEAT, L AOA, AND EQPT CLG FAN STATUS. EICAS MSG. DECLARED EMERGENCY. VISUALLY INSPECTED C901 IN P31 PANEL FOR LOOSE OR BROKEN LUGS/TERMINALS AS REQUESTED BY TECH SUPPORT, NOTED NO LOOSE OR BROKEN LUGS. C/W SYSTEM TEST OF EQUIPMENT COOLING SYSTEM REFERENCE: TASK 21-58-00-735-068-011, NO DEFECTS NOTED . NEEDS FURTHER TROUBLESHOOTING FOUND C310 115VAC BUS L SECTION 3 CIRCUIT BREAKER REQUIRED LOW EFFORT TO PULL. REPLACED C310. INSPECTED P31 PANEL AREA NO DEFECTS NOTED. FOUND F/D EQUIPMENT COOLING SUPPLY FAN 1 HAD CURRENT IMBALANCE. REPLACED B10139 SUPPLY FAN. CHECKED CURRENT DRAW OF PITOT AND AOA HEATERS; FOUND NORMAL CURRENT DRAW WHEN ON AND NO CURRENT DRAW WHEN OFF. RAN ENGINES ACCOMPLISHED POWER QUALITY CHECK FOR THE L AC BUS SECT. 3. MAXIMUM CURRENT IMBALANCE 7%. BREAKER REMAINED IN DURING TESTS.