What was found
CREW REPORTED "AFTER TAKEOFF FROM PHL ENROUTE TO CLE, LANDING GEAR WOULD NOT RETRACT. HANDLE WORKED FINE. (DIVERTED TO EWR, LANDED UNEVENTFULLY) POST FLIGHT INSPECTION REVEALED NO GEAR PINS IN LANDING GEAR." AIRCRAFT MAINTENANCE FERRIED TO BTV GEAR DOWN, MAINTENANCE REMOVED AND REPLACED LT NR 2 MAIN LANDING GEAR PROXIMITY SWITCH IAW EMB145 AMM, REMOVED AND REPLACED LGEU IAW EMB145 AMM AND REMOVED AND REPLACED LANDING GEAR CONTROL LEVER IAW EMB145 AMM. OPS. CHECKED LANDING GEAR GOOD. AIRCRAFT RETURNED TO SERVICE.