What was found
MAIN LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. REMOVED PROXIMITY SWITCH, 5GBC, PN: D22858000-1, SN: B931 DUE TO INTERNAL FAILURE. INSTALLED REPAIRED PROXIMITY SWITCH AS STATED ABOVE IAW F2000 MM 32-61-49-900-801. REMOVED PCB CARD, 415JE, PN: C1381, SN: 3305 DUE TO INTERNAL FAILURE AND INSTALLED NEW PCB CARD AS STATED ABOVE IRW F2000 MM 32-30-00-720-801. REMOVED PCB CARD, 417JE, PN: FE422, SN: 18920 DUE TO INTERNAL FAILURE AND INSTALLED NEW PCB CARD AS STATED ABOVE IRW F2000 MM 32-30-00-720-801. RIGGING/ADJUSTMENT OF PROXIMITY SWITCHES 5GBC AND 5GBD ARE REQUIRED. ADJUSTED PROXIMITY SWITCHES 5GBC AND 5GBD IAW F2000 MM 32-61-49-900-80. TESTING OF THE PROXIMITY SWITCHES 5GBC AND 5GBD, AND FUNCTIONAL TEST OF EXTENSION AND RETRACTION OF LANDING GEARS AND DOORS ARE REQUIRED. TESTED PROXIMITY SWITCHES 5GBC & 5GBD IAW F2000 MM 32-61-49-900-801 AND FUNCTIONAL TEST OF EXTENSION AND RETRACTION OF LANDING GEARS AND DOORS IAW F2000 MM 32-30-00-720-801. FUNCTIONAL TESTS WERE SATISFACTORY, OK FOR SERVICE. PARTS REMOVED: CIRCUIT BOARD, PN: FE422, SN: 18920, CIRCUIT BOARD, PN: C1381, SN: 3305, PROXIMITY SWITCH, PN: D22858000-1, SN: B931.