New Holland LX665 Hydraulic Problem

Just purchased a 1998 New Holland Lx665 w/ 2800 hrs on the meter. Overall good condition for the year.

Here's the problem I'm having:

After being warmed up and lifted from the rest position, the loader arm will creep down fairly quickly. I don't think it is the cylinder packing because I cannot duplicate the problem with down pressure. Also, while loader arm is creeping down, if pedal is pushed very slightly forward (to move loader down) the loader arm will actually come up.

Has anyone...

New Holland LX665 Hydraulic Problem

New Holland LX665 Hydraulic Problem