!dev but still rant

So I'm a photocopier technician by day, alcoholic coder by night. Just spent 3 fucking hours trying to diagnose a black line on print outs, checked drums, dev units, toner cartridges, fusing unit, everything...

Called up one of the guys I work with and they said to come back with some samples to try and pin it down...

I turn around to leave and remember I didn't check the transfer belt and lo and behold it isn't cleaning and is smearing the paper...

3 fucking hours to work out such a simple error, I've had program breaking bugs diagnosed and fixed by then... ugh -.-