I've just got an indesit like yours and having carried it into the house, don't think you should have a problem getting to the pump. If you can safely tilt the machine back, follow the outlet hose to the rubber 'trap' and the pump. You can feel if there is anything in the rubber trap - and if so, disconnect, usually with a srewdriver - or maybe a spring-clip fitting and allow the blockage to drop out (watch though you may get a bit of 'flooding'). You might also be able to feel for blockages in the pump from here - without having to take it off. Hope this helps.
Joe Soap
August 2007