As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF, THE LANDING GEAR FAILED TO RETRACT WHEN SELECTED UP. AFTER THE UP SELECTION THE HYDRAULIC PRESSURE WAS SEEN TO FAIL. AIRCRAFT RETURNED TO BLOCKS. INVESTIGATION REVEALED THAT A MANIFOLD BLANKING PLUG HAD CRACKED UNDER THE HEAD AND ALLOWED SYSTEM FLUID TO ESCAPE. NEW PLUG INSTALLED.