What was found
AFTER TAKEOFF, WHEN RAISING THE LANDING GEAR, THE RT MLG DID NOT RAISE BUT THE NOSEWHEEL AND THE LT MLG RAISED, THEN THE LT MAIN CAME BACK DOWN. AT THAT TIME WE HAD LT AND RT GREEN ARROWS AND RED LIGHTS, AND NO RED OR GREEN NLG LIGHTS, NO FLASHING GEAR HANDLE NOR "GEAR GEAR" ANNUNCIATOR. RAN THE EMERGENCY CHECKLIST, PUT THE LANDING GEAR HANDLE DOWN AND GOT PROPER 3 GREEN AND NO RED INDICATIONS. JACKED ACFT, FOUND NOSE GEAR LT PROIMITY SENSOR TO BE OUT OF ADJUSTMENT, ADJUSTED PROXIMITY SWITCH, OPS CHECKED GOOD AND DOWNJACKED ACFT.