ORIGINAL: ww2birds
Could also be bleed-thru of the retract cylinder from one side to the other .. try some of the magic bvm thin lube .. inject in the airlines at the retract on both sides, and cycle it a bit. I've seen a few cases where a nosegear on a Kingcat did this for the first few cycles after sitting for a while .. cycle a few times with manual assist on the retraction and it's fine.
Dave
I was about to use BVM Thin Lube on a UP valve but called UP and was specifically told not to use it. Apparently it will eat away the seals in the valve. Use silicon spray if you need to lube the valve.
The bleeding problem is a common symptom when you have a leak through one of the gear or door cylinders. If you clamp off both sides of each cylinder (one at a time so it can take a while) you'll likely find your culprit.
Regards,
Jim