What was found
FLT 6193 - IAD-JFK - DURNIG CLIMB, MADE AN UNSCHEDULED LANDING DUE TO BOTH VOR'S READING FROM OPPOSITE SIDES. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND FOUND CANNON PLUGS SWITCHED ON BACK OF CONTROL HEADS. DISCONNECTED AND INSTALLED CANNON PLUGS ON PROPER UNIT, OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (M)