Home straight now! Each bulb is a simple push and twist to remove / replace.SUGGESTION - Do NOT put the spare bulbs on the top of the engine cover when replacing, as that's just asking for trouble (yes, I did...)Having rescued the silver bulb, pop it in.Again, best to test the bulbs at this point.Once confirmed ok, put the holder back in place in the lamp unit.This is a little tricky, as you're working blind, and the holders only fit in one position - but a bit of fiddling and you're good to go.Make sure you twist them securely in to place - twist until they will twist no more (again, about a third of a turn)