It happens that Stephen formulated :
Hello,

We have got a Panasonic combined oven/grill/microwave so I don't think
it's necessarily cheaper to throw it away rather than get it repaired.
The other day we saw some steam coming from under the door. I looked
and I am sure it came from under the door rather than a vent under the
oven. So my worry is, if steam can get out, can microwaves?

If I take it to a repair centre, what do I look for in the Yellow
pages: small appliance repairs? What is the going rate do you think
for a "check-up"?

There doesn't appear to be any damage top the door, so I am not sure
what has caused the leak: a faulty seal perhaps?

The seals are not designed to be steam proof, but only to protect YOU
from the escape of microwaves. If you have concerns, get a microwave
leakage detector. They are not expensive - probably Maplins will sell
them.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk