problem with leaking water on my hotpoint washer dryer wmd73?

hi,i have a leak only on the drying side.i have taken the back off and removed the pump.i am a electric motor engineer so i dismantled the pump and cleaned out the inside(which was full of fluff etc).when reconnected and replaced on to the washer it worked ok through a washing cycle, but when i ran the dryer cycle,half way through i noticed a leak coming from under the drum? the pump seems to take water away most of the time and then doesnt which i think creates this problem.please help its doing my head in!!!!

rich
May 2005