Hi, I'm new to this so if I'm doing something wrong apologies! Have a Multipla jtd 1.9. Glow plug/lamp light lit up on dash board 6 months ago and Fiat charged me £70 to attach to computer plus another £50 to change one glow plug. Now light is flashing again! Have tried local garages but they say they don't have the equipment to test/change the thing. Any suggestions or is this one thing I have to ask Fiat to do at vast expense? Is it best to change all glow plugs at same time?