The "Phantom" jam sometimes called a "No Pick" (paper not advancing in the paper path) from the tray and can be related to worn rollers and other causes. The error code on the CP should be a 13.01 on the P3015 and 13.B2.D2 on the M525 (same paper path).
Paper loading in the tray cassette can be a common cause for No Pick jams, attached is a link to a document that explains how to load the tray cassette to prevent No Pick/Phantom jams:
I work for HP
