As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HYD FAILURE IN FLIGHT, NO FLUID IN NR 1 RESERVOIR. NO PRESSURE IN NR 1 SYSTEM. RAN QRH, LANDED FLAPS 0 AND EMERGENCY BRAKE. SKYDORL LEAKING FROM LT SIDE OF ACTF WHERE WING ROOT MEETS FUSELAGE. REMOVED AND REPLACED RELIEF VALVE ON NR 1 SYSTEM IAW Q400 AMM 29-11-51-000-801. PERFORMED LEAK AND OPS CHECK GOOD IAW Q400 AMM 29-11-51-710-801. NO LEAKS FOUND. P/N ON 975255-5, S/N OFF 0238, S/N ON 0039. (S)