Case 610 clutch won�t disengage and 3pt wont lower

Has positive up/down on the 3 pt hitch.
I can easily RAISE implements but not lower them. Oddly though it seems the lighter the implement (ie blade) the easier it goes down. I can eventually lower heavier impiments (ie 8�disc) by revving the engine but hate to do this.
As I can raise I don�t think it�s a pump issue..
Over the past year the clutch (hydraulic-has the auto transmission) has gotten worse and is now at the point where pressing the clutch pedal does not disengage the clutch so you can�t shift. The clutch problem started out as an occasional glitch that went away as the engine warmed up (and the oil I�m assuming) and has gotten worse over time.
I�m not a mechanic but would like to have it repaired if the cost isn�t too high ($2,000 range).
I�ve changed oil , checked filters and that didn�t solve the problem.
Have the full service manual so if anyone can give me an idea on where to start looking to solve this problem it would be appreciated, Thanks