Indesit dryer

Indesit Idc8t3buk. Had a look at this dryer.Complaint was condensation on utility walls and makes a strange noise/whine after a while(not heard noise personally but have seen the video) Checked motor and both fans, all good.Checked and tested water pump and micro switch. Cleared all channels into pump sump. No signs of any water ingress in heater housing. Condenser spotless. Phone call an hour later saying it still doing the same. What am i missing.