What was found
WHILE PERFORMING T/C 78233008, FOUND RT AFT OVER DOOR EXIT SIGN AND OVERWING HATCH HANDLE EMERGENCY LIGHTS INOPERATIVE. GROUNDED - YES. ACCESSED CONNECTORS D12460, D12462, AND D12464 IAW AMM 33-21-00. IAW WDM 33-51-13-8 EXPECTED 6 VDC, FOUND 0 VDC ACROSS 464 PIN 1 TO GND, & D12460 TO GND. REPLACED POWER SUPPLY FUSE IAW AMM 33-51-06. 6 VDC RETURNED TO CONNECTORS, ON OPS CHECK. FUSE BURNED OUT AGAIN. FOUND L751 PIN 1 SHORTED TO GND. WIRE 3 FOUND PINCHED IN L751 SUB ASSY. REMOVED THE WIRE HARNESS FROM THE SUB ASSY & INSTALLED REPLACEMENT FROM NEW PART IAW CMM 33-20-67. REINSTALLED BOTH ESCAPE HATCH LIGHT & EXIT LOCATOR IAW AMM 33-21-00 & A NEW POWER SUPPLY AS A PRECAUTION IAW AMM 33-51-06; OP CHKD GOOD.