As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN CRUISE AT FL 250 NR 1 HYD ISO VLV CAUTION LIGHT COMPLETE LOSS OF FLUID. MX FOUND NR 1 EDP SEAL DRAIN LEAKING. REPLACED NR 1 EDP & FILTERS IAW MM CH 29-11-01 & SYS INSPECTED IAW TASK 05-54-00-280-801. LEAK & FUNCTION CHECK SERVICEABLE AFH 9795.33, AFC 7455 PART TIMES TSN & TSR 9795.33 HRS, 7455 CYC.