What was found
WHEN GEAR HANDLE WAS RAISED AFTER T/O, 1 SPARK CAME OUT OF GEAR HANDLE MECHANISM. INSTALLED GEAR PINS AND RAISED GEAR HANDLE AND DESCREPANCY REPEATED WITH C/B B1-415 POPPING. REMOVED DISPLAY UNITS 3 AND 4 AS WELL AS GEAR INDICATOR. FOUND WIRE B007-12-22 BROKEN AND SHOWING SIGNS OF ARCING. ALSO FOUND WIRE B007-9-20 DAMAGED. R & R WIRE B007-12-22 AND SPLICED WIRE B007-9-20, APPROX 6 INCHES FROM BACK OF INDICATOR. LIGHTS NOW OPERATE NORMALLY. LANDING GEAR IND. SYS STILL REQUIRES FULL OPS CHECK. RE-INSTALLED NR 3 AND 4 DU'S. REF: AMM 31-61-03-2. OPS CHECK NORMAL. RE-INSTALLED GEAR INDICATOR REF: AMM 32-61-11-4. ACCOMPLISHED LANDING GEAR POSITION INDICATION TEST IAW MM 32-61-00-5. SYS OPS CHECKS OK. ACFT OK FOR SERVICE.