If you are going to work with a flash gun or any electrical power you need to first put on the pukka safety glasses and only then open the unit...

Capacitors in any device have failure modes where they explode and you can be a long time blind. The report is like 0.45 long colt, the bits of the casing of the capacitor go a long way.

Apart from the jolt you can get from a capacitor hurting good at the very least, they can hold charge for a long while after they are off, and still hurt good.

The flash caps are high voltage rated the suppliers should send you a suitable replacement.