If you use rcd’s plug it in and switch each individual item on one at a time until the fault trips the rcd, if it was a leaky pump you would have found moisture on the floor or felt it on the underside of the machine.
Check the wiring for broken wires and the cable for lumps in it, can indicate the cable has broken inside.
Likes been said I would take a guess at the carbon brushes on one of the vacs have worn down.
John