What was found
CREW REPORTED AFTER DEPARTURE FROM MDW AT APPROXIMATELY 3000' THE RT ENG OIL LT CAME ON AND OIL PRESS READ ZERO. PERFORMED RH ENG SHUTDOWN AND RETURNED TO MDW. BEFORE LANDING, THE CREW REQUESTED EMERGENCY EQUIPMENT TO BE STANDING BY. AIRCRAFT LANDED WITHOUT FURTHER EVENT. MAINTENANCE FOUND LUBRICATION LINE B NUT NEAR PROP GOVERNOR LOOSE ON RIGHT HAND ENGINE. TIGHTENED B NUT. SERVICED ENGINE OIL. PERFORMED 4 ENGINE RUNS TO HIGH POWER TO LEAK CHECK. NO LEAKS NOTED. OPS CHECK GOOD. AIRCRAFT WAS RETURNED TO SERVICE.