As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
2R PASSENGER DOOR OVERHEAD EMERGENCY LIGHTS WILL NOT TURN ON. MAITENANCE MESSAGE 33-11404. GROUNDED - YES. REMOVED AND REPLACED 2R WELS BATTERY PER B787 AMM 33-51-07. OPS CHECK FAILED (26771). REMOVED AND REPLACED FWD PRIME WELS CONTROL UNIT BATTERY. CHECKS GOOD IAW AMM 33-51-07-02B-720AA. OK FOR SERVICE.