truma c6000 fuses

hi all,
where the feck are the fuses on a c6000 truma heater. I have no lights on the switch panel. There is nothing on the switch panel PCB that looks like a fuse, there are three small glass fuses on the main control panel PCB but they have coloured stripes on them? Are these the fuses? If so there is a single and two besuide each other underneath the single one, it says F3 should only be changed by an expert?

Thanks

thanks Tristan, you are a font of knowledge! It is a Knaus from 1998 with the factory fitted switch panel. Will there be a feed to the Truma control unit with an inline fuse in it somewhere ?

tristan ive found and checked the fuses, they are OK. revis van owner had bypassed the main switch board fuse feeding the heater circuit when fitting a CD player !!! so now im getting power but no heating, hsnce my other post! thanks