Portable Oxygen Concentrators (POC) repair/service

The portable oxygen concentrators I’ve used do not involve oxygen canisters. My husband’s unit shorted out while we were in Zihuatanejo, and we could not find a repair service. We ended up (with the help of our property manager) finding a computer repair person who worked with an electrician to fix it, but going this route voided the Canadian manufacturer’s warranty. However, it was a potential life or death situation for the flight home so we went ahead with the repair.