I think the PDF covers less work than the post above. From the PDF, I think you have to do the valve clearance. That is why you replace the rocker cover gasket.
No1 reason for failure for these engines is the oil. The leaking injectors help to destroy the oil and then the engine. If there is a single work you should do for this service, is the injections seals.
Save money by changing the air and pollen filter by yourself and pay for the injector seals.
If the injectors are visibly leaking, it is too late.