As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 2 HYDRAULIC MANIFOLD EDP (ENGINE DRIVEN PUMP) CHECK VALVE BACKS OUT, O-RING AND BACKUP RING SHEAR ALLOWING PRESSURE INTO THE EDP PRESSURE SWITCH WHEN THE ELECTRIC PUMP IS ON AND ENGINE IS SHUT DOWN. RECURRING DEFECT DUE TO IMPROPER LOCKING DEVICE ON THE CHECK VALVE. MFG FIELD SERVICE REP. NOTIFIED. NO ACTION TAKEN BY MANUFATURER.