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Last week's job was replace the sensor set and while doing so, look at the vertical white toothed bels, at the bottom rear....its slack while the front one is correctly tensioned. It bugged me so today we planned some work so I could hit it....assuming it was stretched. Also the front one has some steel braid bursting through, time to replace.
New belts (30mm wide, around 1.5 mtr long) and new style tensioner/clamp mechanism fitted...but the rear one was still slack

. It was a tooth out on the bottom toothed pulley and no amount of pulling would get it round that extra tooth, so undo the bottom base plate for the pulley shaft assembly, that allowed the assembly to lift a mm or two and gave me the extra tooth I needed, tighten it all up, tension belts, tidy up and monthly service the machine.
3 hours...spent a good proportion of that on my back, squeezed into the machine, no room for manoeuvre, lots of clamp and adjusting bolts with poor access. Nice, proper mechanical job though.