As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENGINE HARNESS MW0316 HAS CHAFED INSULATION AT FWD UPPER FAN FIRE DETECTOR 2 INCHES FROM RING TERMINAL. GROUNDED - YES. REMOVED RING TERMINAL AND HEAT SHRUNK TEFLON HEAT SHRINK OVER AREA. NO DAMAGE TO INNER WIRE. RETERMINATED RING TERMINAL PER B737-800 SWPM 20-30-11 AND B737-800 WDM 20-11-11-01. FIRE DETECTION SYSTEM GROUND VERIFICATION PASS REF B737-800 AMM 26-11-00-710-801