We have had a De Dietrich oven since 2004, and recently it has started to behave a little strangely. The interior light stays on even when the oven is turned off, and the self-cleaning heaters never heat up. Iasked De Dietrich for a wiring diagram and a manual, but they won't let me have them, and only want to set up a service visit, at presumably a huge cost. Does anyone have any knowledge of these things? I am perfectly competent with electrical troubleshooting, but need to have some information to work with. All the internal wires are unlabelled! We recently had some power problems in the area, due to a contractor damaging some overhead cables, so it is possible that a spike may have hit it and damaged something.