Report "I have a JRC model JMA 1100 color plotter and radar 1800 with 2 kw radome. It has lees than 300 hours transmit time over 3 years. It is mounted about 25 feet above the water on the mizzen mast of a catamaran sailboat kept in the tropics. The magnetron has failed. Where do I get replacement parts or a new radome NkE 1065 I beñieve it is- I am in costa rica, but usually buy this type of merchandize in USA. The local techie says that when the only thing on the screen is tiny specs, the magnetron has failed and usually that means also a circuit board usually goes and a special switch, but I don't have the switch that allows two station control"