For your education, Google search "Flyback transformer"
There are a number of rebuilders, replacements, and substations.
B&H Electronics
https://www.bhelectronics.com/products/dc-dc-power-products/isolated-flybac…
Pactran
http://pactran.com/why-pacific-transformer/?gclid=CNWWzLzVx9MCFQkaaQodop0BTQ
greg
Chicago
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