As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE HYD POWER PACK REPLACED WITH AN O/H POWER PACK. O/H POWER PACK WAS INSTALLED AND SERVICED IAW MM. DURING THE TESTING OF THE UNIT, MX NOTICED THAT THE GEAR WAS NOT EXTENDING SMOOTHLY, IT EXTENDED ABOUT 6 INCHES AND STARTED TO CHATTER. SYS WAS BLED SEVERAL TIMES WITH NO IMPROVEMENT. A SECOND POWER PACK PN 10138800521 WAS INSTALLED. SYS BLED AND TESTED WITH NO PROBLEMS.