What was found
AHM DETECTED WELS MMSG {33-12114} CLASS 14 - REMOTE WELS CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WIRELESS EMERG LIGHTING SYS CONTROL UNITS REF FIM DMC-B787-A-33-50-F1-V7A-421A-A TO CONFIRM FAULT. CON'T FAULT ISOLATION AS REQ'D. REF CONFIG DWG 2520DD16113 TO AID LOCATING WCU CLASS 14.3 M3351039 AT DOOR 3L AFT. CARRIED BY ELB CONFIRMED FAULT 33-12114 WITH GROUND TEST. PER FIM 33-50-F1-V7A-421A-A, REPLACED 14 WCU AMM 33-51-07. NO JOY. CHANGED ANTENNA 33-51-07. NO JOY. CONTINUE TS. RE-INSTALLED ORIGINAL WCU AND REPLACED WBU, GROUND TEST PASSED WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNIT INSTALLATION.