What was found
INSPECTION TYPE: E TOP, DURING APPROACH WITH FLAPS & GEAR UP, AUOPILOT AUTO THROTTLE ENGAGED, PASSING THRU HEAVY RAIN, MULTIPLE SIMULTANEOUS EICAS MESSAGES OCCURED INCLUDING STBY PWR, L/E FLAP DISAGREE, EQUIP COOLING, APU BOTTLE, AIR GRND SYS, AUTO BRAKE, AUTO THROTTLE, AND OTHERS. EMERGENCY DECLARED, FOUND STBY BUSS INOPERATIVE. TROUBLESHOT IAW FIM 24-33-00, FIG 104, SHT 1, STEPS 1,2,10,11, 12 & 24. R & R BATTERY TRANSFER RELAY K106 & MAIN BATTERY RELAY K104 IAW MM 24-33-02-4, STBY POWER SYS OPS CHECKED GOOD IAW MM 24-33-00-6. NO STATUS MSGS DISPLAYED & LT VHF. OPS CHECKED GOOD.