Checked the circulation fan and it is clear, customer confirms that she puts clothes in sets program and does not interupt it. Also looked into fitting a new timer but this machine has the digital program selector type of timer and a module to detect dryness, ie not the usual timer found on these dryers, module was going to cost me about 50 quid plus vat, so I have had to wave the white flag and refund the customer for work carried out.
hey ho… but thanks for your help fellas.