I would change them both if you think it is worth the money, this oven looks to be produced in 1993.
http://www.espares.co.uk/parts?k=8996619132583
http://www.espares.co.uk/parts?k=8996619130942
It looks like it was produced for the German market hence no reference to a PNC. After some digging it turns out the KD number "611577925" is in fact the PNC for this model. Sorry for the confusion
Hello zipper
Thanks for your reply and more useful info.
I bought a new kitchen in 1993 from MFI and all the AEG appliances were sold by MFI and included in the package. I cannot think where the German market came in unless MFI had a cheap deal.
This oven and a fitted fridge are still like new.
Thanks for help
JDL