What was found
FLT 388 - RIC-PIT, AFTER TAKEOFF, LANDING GEAR WOULD NOT COME UP. GROUND/FLT ALERT MESSAGE ON MFDU. NO EMERGENCY DECLARED. FLIGHT RETURNED TO RIC WITHOUT FURTHER INCIDENT. LANDING AND TAXI WAS NORMAL. MAINTENANCE ADJUSTED BOTH AIR/GND SENSORS ON BOTH MAIN GEAR ASSEMBLIES. MULTIPLE GEAR SWINGS PERFORMED. NO PROBLEMS NOTED. (M)