As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WAS IN FLIGHT AND UNABLE TO OBTAIN 3 GREEN LIGHTS. WHEN GEAR WAS SELECTED DOWN. MANUAL EXTENSION WAS USED SUCCESSFULLY. FOUND POWERPACK EMPTY. FOUND LEAKING FITTING ON BOTTOM OF PACK. REPLACED O-RING, MS28778-A AND SERVICED SYS WITH 5606. PERFORMED 10 GEAR CYCLES SUCCESSFULLY WITH NO LEAKS NOTED.