HI MIke , I did pull all those fuses behind then side panel but only one at a time because not all the sockets were filled and i didn't want to get "confused" .
Personally I think it may be something to do with the emergency flashers or the burglar alarm system. the test lamp flashes just like if the emerg flashers were on or if the alarm system was activated . You know how the radio and signal lights flash on and off when the alarm is activated.