What was found
ON TAXI IN GEN 4 OFF BUS MSG RECEIVED. STARTED APU & NOTICED THAT APU GEN WAS NOT SHARING THE LOAD. IT REMAINED AT 0 AMPS, FLIGHT ATTENDANT REPORTED STRONG ELEC BURNING SMELL IN CABIN. UPON SHUTTING DOWN ENG 1, DC BUS 1 WENT UNPOWERED. AT GATE, AIRPLANE WOULD NOT POWER OFF EVEN WITH EVERYTHING SHUTDOWN & BATTERIES IN OFF. R & R NR 4 BUSS CONTACTOR, PN 464CC01Y1 & SN 1091 IAW AMM 20-13-02, DID NOT FIX. SEE ITEM 2 OF THIS LG PG. R & R NR 4 MAIN GEN IAW AMM 24-31-01. OPERATIONS CHECKED GOOD IAW AMM 24-31-00. LEAK CHECKED GOOD IAW LOG PG 3860476 ITEM 1 FOR APU GEN CORRECTIVE ACTION. FOUND TO BE CAUSED BY GEN 4. PERFORMED OPERATIONS CHECK OF APU GEN IAW 24-34-00. OPERATIONS CHECKED GOOD. INSPECTED PAX CABIN LIGHTS IAW AMM 33-21-00. FOUND SIDEWALL LIGHT AT 2A BROKEN AT PIN SIDE & STRONG SMELL. R & R SIDEWALL LIGHT 2A IAW AMM 33-21-06. OPERATIONS CHECKED GOOD. NO ELEC BURNING SMELL NOTED. LIGHTS AT SIDEWALL 5C - 6C R & R. OPERATIONS CHECKED GOOD AMM 33-21-06. INSPECTED FLASHLIGHTS & FOUND FLIGHT ATTENDANT FWD FLASHLIGHT STRONG ELEC SMELL. R & R FWD FLASHLIGHT PN P2-07-0009-520 IAW AMM 33-50-16. OPERATIONS CHECKED GOOD. NO ELEC BURNING SMELL NOTED.