As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A ATB - AFTER DEPARTURE THE CREW EXPERIENCED A HYD SYS PUMP FAILURE. THE A/C RETURNED TO SDF. NO EMERGENCY WAS DECLARED, AND THE A/C LANDED WITHOUT FURTHER INCIDENT. TROUBLESHOT THE LEFT PRESSURE SWITCH PER FIM. REMOVED & REPLACED LEFT HYD PRESS SWITCH IN REFERENCE TO MM 29-11-18-4. NO LEAK NOTED. OK FOR SERVICE.