What was found
MLG STEERING EICAS ADVISORY EITHER MLG AFT AXLE IS INDICATING- NOT LOCKED. LVL 1 FOR MLG STEERING CONTROL ACT RT IS UNSERVICEABLE, MSG 32-63020. MGSCU REPLACED. CONFIRMED STEERING ACT PINS NOT IN VIEW & SELECTOR LEVERS MOVED TO LOCKED POSITION. CB PULLED. CYCLED SWITCH MULTIPLE TIMES, RECHECKED READINGS. PERFORMED WIRE CHECK FROM MGSCU CONNECTOR PINS D1 TO GND READING OPEN. D2 TO GROUND READING OPEN. D1 TO D2 READING 2.3 OHMS. PERFORMED WIRE CHECKS TO RT MLG STEERING PCA CONNECTOR 5 & 6. WIRE CHECKS GOOD. PERFORMED STEP F1 OF FIM 32-53 TASK 810. SUSPECT HARNESS W7187 TO BE FAULTY. DETERMINED THE PCA WAS FOUND FAULTY, NOT W7187. REPLACED RT MLG STEERING ACT IAW AMM32-53-03-401. OPS & LK CK'S OK.