As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING NORMAL GROUND RUN-UP, HYDRAULIC TEST WAS CARRIED OUT, HYDRAULIC PRESSURE FAILED TO RETURN TO NORMAL. SHAFT BETWEEN THE HYDRO-PACK (P/N C632A2156201) WAS FOUND SHEARED AND THE PACK SEIZED.MANUFACTURES TECH REP TO ATTEND AND REPLACE THE SHAFT AND PACK.