The 042-326 is the ibt belt not tracking. Once you get that fixed you will be able to fix the other issues.
If you have a bustled Fiery, the power switch should always be on 1. The green led is used to turn it off/ on if needed. press and hold it to shut down, press once to turn on. You should see a 00 on the side when it is up. When running properly you shouldnt have to use the led switch. The machine power should turn the Fiery off/ on with it.