When I load paper in rear tray, the mechanism doesn’t take the paper down into the machine for printing and I get a message saying that the paper tray is empty. If I gently push a sheet of paper down into the rear tray, the message is that there is a paper jam.
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Also, it’s possible the rollers are a little “gummed up” on their “axles” with dust… Iso-propyl may help ease/flush it out. And if per chance it’s all too dry in there (due to the dust and subsequent cleaning too) a very minor lubrication may be required. Possibly a very small trace of very fine oil – watch makers’ or very light machine oil; or possibly a trace of silicone lubricant (as used on curtain tracks etc.) might also suffice? The latter might be the better to use?
And once things are working a little more as was, perhaps cycle a few scrap pages through both paths to really disperse the lubricant fully around the roller axles/bearings etc. just “print” a few random characters – no more than that – so as to avoid wasting ink each time you run the scrap pages through.