So, this was most certainly unexpected. I was inspecting the inside of a DMG-001 that I've owned since 1990, to see why the audio was gone before I go through with restoring it.
A suicide note from an assembly line worker came out from behind the metal plate behind the cartridge slot.



So...Yeah.... I don't think I felt like sleeping tonight anyway.

That is a very, very unsettling thing! Someone mentioned the possibility that it might've been a weird prank from a bored assembly line worker. I hope that's the case. If not, maybe some caring person came along and talked him out of it.

I'm not really into this sort of thing, but this sounds like something that people would make a creepypasta out of.

My mom had suggested that, since they never wrote their name.
If true, I do hope that they got help before it was too late though.

Unfortunately, I'm just not able to fix the audio for some reason, so I've purchased another.
http://www.ebay.com/itm/222509564816?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

It's not perfect, but for what I want to do with it, it's perfect enough.