It's quite easy to service an ECT machine, remember that the ECT does NOT "defib" the brain but aims to apply only sufficient electrical charge in order to induce a temporary epiletic convulsion in a patient.
Basically all you need to do is to check that the constant current output pulse is rectangular and no wider than 1ms ( NEVER any other shape like sine wave which is prohibited for ECT stimulus in Britain since 1982 ) and that changing the energy level only changes the number of pulses applied.
Do check that the paddles are not intermittently conducting and the EEG amplifier and graph ( if fitted ) are working correctly and the usual IEC60601 Electrical Safety test.
Nothing to it really

As far as I'm concerned, whatever I think about a particular medical procedure, the equipment for that procedure must meet it's specifications fully like all other medical gear - one day someone I know may need that procedure!