What was found
AIRCRAFT WAS GROUNDED: LEFT MAIN GEAR WOULD NOT RETRACT WHEN GEAR HANDLE WAS RAISED. RETURNED GEAR HANDLE TO DOWN POSITION AND RECEIVED NORMAL GEAR INDICATION FOR MAIN GEAR. RETURNED TO TUL, EMERGENCY DECLARED AND ;LANDED WITHOUT INCIDENT. MAINTENANCE FOUND L/H MLG RETRACT ACTUATOR TO BE INSTALLED 180 DEGREES OUT. MAINTENANCE REMOVED L/H MLG RETRACT ACTUATOR TURNED IT 180 DEGREES IN THE CORRECT DIRECTION AND REINSTALLED AND TORQUED IT IAW AMM 32-32-01.