What was found
AFTER TAKEOFF, GEAR HANDLE WAS MOVED TO UP POSITION BUT MAIN GEAR DID NOT RETRACT. MAIN GEAR RED LIGHTS REMAINED ILLUMINATED. NOSE WHEEL APPEARED TO RETRACT NORMALLY. LT & RT STEERING, LT & RT BRAKE & HYD NR 2 PITCH MINELCOS ARE RED. PERFORMED GEAR EXTENSION/RETRACTION TESTS IAW MM 32-31-00-860-801, PERFORMED THE TROUBLESHOOTING OF THE LANDING GEAR CONTROL PCB IAW F2000 FAULT ISOLATION MANUAL (FIM) 32-30-00-810-901, PERFORMED THE TEST OF THE LANDING GEAR SYSTEM PROXIMITY SWITCHES FIM 32-61-00-810-901, UTILIZING BREAKOUT BOX TESTED OPERATION OF PCB 417JE PER WDM 32-31-00 AND 32-62-00, BENCH TESTED/RING OUT OF LANDING GEAR CONTROL HANDLE IAW MM 32-31-01-900-801. ALL TESTS PERFORMED WHILE COLD SOAKING AND MANIPULATING ASSOCIATED WIRING. NO DEFECTS NOTED, COULD NOT DUPLICATE DISCREPANCY. AFTER DISCUSSION WITH MCC, REPLACED NLG LT WOW PROX DETECTOR, REPLACED L/G CONTROL PCB 10GW, REPLACED RELAY PC417JE IAW MM 32-61-49-900-801,32-30-00-810-901,24-00-00-910-801,32-31-00-860-801. OPS CHCKED-NO DEFECTS. CIRCUIT BOARD (P/N: C1626-2, S/N: 183), RELAY (P/N: F302-122, NSN), PROXIMITY SWITCH (P/N: D22858000-1, S/N: U07).