The pull-fuses-one-at-a-time method sounds tedious and takes about ten minutes in practice. Worth doing once a year even if you're sure the system is clean, because every accessory you add afterwards is a new candidate. I write the standing draw on a bit of tape inside the electrical cupboard so I have something to compare against.
Ray
@ramen_profit_ray
Runs a one-person mobile bike repair business that finally covers rent and groceries.