Key will not return to position 0

I spent the morning exploring where the relay(s) for the interior lights might lurk. I was told to look behind the kick panel on the passenger footwell but could find nothing of note there. Checked the two fuses in the boot and they are OK. Swapped the two green relays over that reside in the same boot location but still can't get the interior lights to work. Everything else on the car is working (touch wood), except the headlamp washers and the interior lights - damn frustrating. Could it be the GM? I have a set of capacitors for he job of replacing them in the GM but am very nervous about doing something wrong that renders the car unusable.