Faulty Panasonic microwave (Abingdon-on-Thames OX14)

An 850 watt Panasonic microwave, about 16 year old, worked fine until a few days ago then started displaying error H97. I think this just means a door safety switch is busted so it can't be sure the door is properly shut. Pretty easy fix if that's the case. Might be something less simple of course - magnetron or similar. Let me know if you'd like to come and collect it. Cheers, David