As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 3 HYD SYS FAILED. PERFORMED EMERGENCY PROCEDURES AND RETURNED TO BASE. MX FOUND THE SPLINE ADAPTER PN 92351-15284-101 HAD BACKED OFF THE DRIVE SHAFT IN THE TRANSMISSION. HYD PUMP INSTALLED HAD THE OLD STYLE SHAFT WHICH WOULD ALLOW THE SPLINE ADAPTER TO SHIFT. REPLACED THE PUMP WITH A PUMP THAT HAD A MODIFIED SHAFT TO KEEP THE SPLINE ADAPTER FROM SHIFTING AND INSTALLED A NEW SPLINE ADAPTER.