I assume spraying bubble solution won’t work in orbit.
I used to find pinpoint leaks with an ultrasonic gadget that heterodyned ultrasonic down to audio range. Worked great on high pressure capillary plumbing for IR detectors.
Colleagues used to use broom handles to find superheated, supercritical steam leaks. If the broom handle was cut in two, you knew to not step in that direction.
That was the story that I heard many times. I never knew if it was true.