Posted for "Ian B. Crowe" <ian.crowe@sympatico.ca>:

  
 I have had the same problem as Gerard.  On top of that sometimes my low
pressure side will bleed off until the pressure switch kicks in and recharges.
 Sometimes it will hold steady and not move at all even if left for a week in
the hangar.  Gremlins?
 
 Ian Crowe