As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF AFTER LANDING GEAR CONTROL LEVER WAS MOVED TO OFF, NOSE LANDING GEAR RED LIGHT ILLUMINATED ALONG WITH GREEN LIGHT. FLIGHT DECLARED AN EMERGENCY AND RETURNED TO MIA LANDING SAFELY. REMOVED AND REPLACED PROXIMITY SWITCH ELECTRONIC UNIT (PSEU) M02061 PER AMM 32-09-00 AND JOB CARD 08L00032003. ACCOMPLISHED SATISFACTORY OPERATIONAL CHECK.