What was found
SUPPLEMENTAL AFTER TAKEOFF LG/LEVER DISAGREE ON EICAS GEAR WOULD NOT RETRACT. C/A-ON INITIAL POWER UP, LG AIR/GND FAIL CAUTION MSG WAS DISPLAYED ON EICAS. CHECKED CMC MSGS IAW AMM 45-45-00. NO RELATED CMC MSGS NOTED. CHECKED LANDING GEAR PROXIMITY SWITCHES IAW AMM 32-63-05. ON GROUND ALL SWITCHES CHECKED GOOD. JACKED A/C IAW AMM 07-10-00. GEAR WOULD NOT RETRACT WHEN TRIED IAW AMM 32-30-00. NOSE LANDING GEAR PROXIMITY SWITCH WAS FOUND FAILED WITH A/C WEIGHT OFF WHEELS. REMOVED AND REPLACED NLG WOW PROX SWITCH IAW AMM 32-63-05. LG AIR/GND FAIL CAUTION MSG NO LONGER DISPLAYED. PERFORMED MULTIPLE LANDING GEAR EXTENSION AND RETRACTION CHECKS IAW AMM 32-30-00. ALL OPS CHECKS GOOD. NO FURTHER DEFECTS NOTED. RAR NOSE LANDING GEAR WOW PROXIMITY SWITCH IAW AMM 32-63-05. PERFORMED MULTIPLE RETRACTION CHECKS IAW AMM 32-30-00. ALL OPS CHECKS GOOD. NO DEFECTS NOTED.