As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING T/S DISCONNECTED 2L WELS CONTROL UNIT,ROWS 3,4,5 FLOOR PROX LIGHTS ILLUMINATED. RECONNECT 2L WELS UNIT AND LIGHT REMAINED ON AND WOULD NOT EXTINQUISH. ***SUPPLEMENTAL ACTION SECTION 4 AND 5: MALE RED 3 PIN CONNECTOR UNDER WCU23 IN MID GALLEY IS BROKEN. REPLACED CONNECTOR UNDER WCU23 AND TERMINATED WIRE IAW EA NO.304699.***(CLOSED)