Panasonic Microwave - with a problem (Cardross G82)

This is a large (and pretty heavy!) Panasonic microwave that we have used for many years. It has recently developed a sporadic fault and we have had to replace it. It's complete with all accessories and instruction book. If anyone feels capable of looking at it and getting it going reliably, they are most welcome. Otherwise it will be heading for the electrical recycling part of the coup!