What was found
AFTER TAKEOFF, THE LANDING GEAR WOULD NOT RAISE WITH THE HANDLE UP. NO EMERGENCY DECLARED, AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOT IAW TSM 32-31-00-810-808A, NO 28 VDC AT SAFETY VALVE 49GA CONNECTOR. REPLACED THE RELAY 62GA IAW ESPM 20-46-50. THE LANDING GEAR CONTROL INTERFACE UNITS 1 AND 2 WERE CHECKED IAW AMM 32-69-00-740-001A, 28 VDC RESTORED AND PERFORMED SUCCESSFUL FUNCTIONAL CHECKS ON THE GEAR SWINGS IAW AMM 32-31-00-720-002A. AIRCRAFT WAS GROUNDED.