As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD GEN VALVE STATUS MESSAGE. THIS PROBLEM SURFACED WHEN MX PROCEDURE WAS BEING FOLLOWED TO DF APU GEN. WERE UNABLE TO SHUTOFF HMG VALVE, DID NOT GO TO CLOSED POSITION, SUSPECT BAD CONTROL VALVE. ATTEMPTED TEST AFTER APU IDG CHG. NO HELP. VALVE MOTOR NR IS Y2350-0075. NO PCN. REPLACED VALVE, NO HELP. REPLACED RELAY K859. PERFORMED HYD MOTOR GEN OPERATIONAL TEST. SYS CHECKS NORMAL.