# SDR ASAA2026012663970

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N589AS](https://openairdocs.org/aircraft/N589AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35686
- Aircraft time: 64,370 hours, 19,387 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Wire Harness
- Condition: Pinched
- Location: Zone 200
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2026012663970

## Discrepancy

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.

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