You've probably resolved your problem, but in case anybody else is wondering:
I just removed the pump today from the rear.
2 torx screws (T20 I think) in the rear hold the top.
9 torx screws hold the rear panel.
Next is a bit tricky cause you can't see very well, but the pump (located at the front/bottom if the machine) is held by 3 torx screws (one size smaller than the screws for the top and rear panel).
Loosen the screws and remove the pump, you can disassamble it further by pulling it apart.
Mine was clogged with textile fibres and chunks of lime stone.
I thoroughly cleansed and dried the entire pump and applied moly-lube to the perm-magnet of the rotor before re-assembling the pump.
Got some nicks and scratches, but IMHO it was well worth it considering the money and time saved.
Mats, February 2009