Damage to offline flyback by hipot test

[Flyback]

Hi,
What kind of damage will be done to an offline flyback during repeated testing at 4kvrms with hipot tester?
The test from L+N to output.

Last sentence of this says hipot testing can damage equipment...

https://tomdunnacademy.org/hipot-testing-101/

"Excessive voltage levels or extended test durations can increase the risk of insulation breakdown, equipment damage, or electrical accidents."

 

[Diver300]

Well any of the isolation components could fail. I would assume that the likely suspects are the transformer insulation, the opto-isolators and any capacitors that connect the HV side to the LV side.