As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AHM DETECTED WELS MMSG {33-11727}CLASS 27 - DOOR 3 LH AFT SEAT REMOTE WCU LAMP DRIVER POWER CIRCUIT IS FAILED REF TO REPLACE WCU. M3351WG01 (CLASS27) @ SEAT 31D.CLASS NO.27 WCU REPLACED AND PERFORMED WCU ONBOARD DATA LOADING FOUND NORMAL. THEN PERFORMED WCU INSTAL LATION TEST. THE RESULT FOUND NORMAL. REFER AMM.