This four page issue notes on page two that June 1956 was “Dent’s out of Fenders” month or, I did you not, “DOOF”!?! I don’t know what to do with that info.
Page three references what may be causing a few DJ-3A noises. One note refers to the “clutch driven disc hub”, which can cause a vibration issues between 33 and 45mph, but I’m not familiar with that part. There are a couple other solutions for particular noises listed.