As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, LANDING GEAR WILL NOT RETRACT AFTER TAKEOFF. MAINTENANCE REMOVED AND REPLACED RIGHTHAND LANDING GEAR PROXIMITY SWITCH IAW EMB145 AMM 32-63-01. OPS CHECKED GOOD. PERFORMED RETRACTION AND EXTENSION OF LANDING GEAR SYSTEM IAW 32-32-00. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.