Posted for "Alain NOIREAUX" <alainoireaux@club-internet.fr>:

Your hydraulic pump reservoir is cracked.I have had the same problem,I think
due to high pressure in the reservoir when retracting the landing gear.
I repared it with a small piece of plastic and epoxyed it on the
reservoir.To avoid high pressure,I made a hole on the cap of the
reservoir,glued on with epoxy,a small plastic tube and curved the tube of
360 °,fixing the loop with a tie wrap.Till now it works fine
Alain NOIREAUX  L320  F-PSDV