As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON GEAR RETRACTION, YD PRESSURE READ 3500 PSI. WHEN ALL GEAR WERE RETRACTED, PRESSURE WENT TO LOW DUTY, BUT READ 1400 PSI. ON TURNING HYD PUMP TO OFF, THE PRESSURE READS 400 PSI. CREW DIVERTED AND LANDED SAFELY. R & R HYD PRESSURE MONITORING UNIT IAW AMM 29-10-00, OPS CHECKED HYDRO SYS AND LANDING GEAR SYS OPS CHECKED GOOD IAW CH(S): 29-00-00 & 32-00-00. ACFT APPROVED FOR SERVICE.