Re: h/pt df61 heater
As the two heaters are £60 & £100 list price and involve a major strip down as well you really do need to be sure you need one. It might just be broken wiring in the door harness, I wouldn’t order one unless I was 100{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} certain it was required for one of these.
As it is a Bosch based machine your customer may be able to see the FD number and possibly even a serial number, it is laser etched into the top edge of the stainless steel inner door.
FD number would give some idea of age.
Jim.