Bunsen Burner

Well I don't know really to be honest. I'm clueless really when it comes to motors. Can gearboxes leak fluid then? They didn't say where it was coming from just that there was one so completely unsure. Why would the engine light still be on though?

Hi all First time poster. Automatic 2.3 problems The car needed a service and then engine light came on. Then the gears started slipping. It seems to only stay in one gear. Max speed is 30mph on high Rev between 3 and 4. Car was serviced yesterday and they said there was a heavy oil leak. And to warn about spark plugs but engine light still on All I want to know is, would it be the spark plugs or anything to do with oil, why its high revving? Or maybe the gearbox itself? Any help would be most appreciated. It's mk2 2000 Cheers