As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE FROM PIT TO TYS, THE CREW EXPERIENCED A TORQUE JUMP DURING FUEL CROSS FEED AND MAINTENANCE CONTROL ADVISED THE CREW TO RETURN TO PIT. MAINTENANCE ISNPECTED AND REPLACED THE HYDROMECHANICAL UNIT IN ACCORDANCE WITH DORNIER MAINTENANCE MANAUAL 73-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.