ok wrote:
A one cup Pyrex cup of water now takes 9:30 to boil.

GE Model # VM2403V 001

Thanks
Manufacture date of 1995.

10 year old OTR would be approx 600watts, which would likely boil a cup
of water under 4-5 minutes.
Since it -will- somewhat work...certainly sounds like the mag is sour.

jeff.
Appliance Repair Aid
http://www.applianceaid.com/