how can I fix my Maver Milk Frother?

The boiler packed up for the 3rd time in 2 years, every time the warranty people fixed it and put in a new boiler. The last time I had to pay all expenses. Now they cannot find another boiler, they gave my machine back to me and It still need a boiler. Where can I find one? can I built in another boiler in the machine. The frother is straight forward, a steel box with a container for water inside for the filter and outside a cappuchino nozzle with a plastic tube that goes into the carton milk. The frother's been discontinued after I've purchased it 2 years ago. I urgently need to fix the machine, as I run a coffeeshop. Hope somebody can give me advise