What was found
LEFT PROPELLER RPM AND TORQUE READINGS REMAINED AT 74 PERCENT REGARDLESS OF CONDITION LEVER INPUTS. NOSE WHEEL STEERING WAS ALSO NOTED TO BE INOPERATIVE. THE CREW SHUTDOWN THE LT ENGINE AND RETURNED TO THE GATE. MAINTENANCE INSPECTED AND FOUND THE CONTROL QUADRANT LEFT CONDITION LEVER TO MICROSWITCH LINKAGE TO BE DISCONNECTED. THE LINKAGE WAS RE-CONNECTED, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 76-11-05. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.