Vauxhall Combo 2004?

Hi

I have a Vauxhall Combo Van which has a wiring fault/flasher unit problem. Sometimes the indicators work and sometimes not, even when using the central locking, the offside lights dont flash. The hazard warning lights always work !

Was wondering if anyone knew if this is a wiring fault and therefore had a wiring diagram that I could get hold of free, or if it is as simple as changing the flasher unit relay??

Need to know urgent before MOT Monday !!

Julian