TB-303 circuit boards

[Justin Herrmann]

Do any of you guys know the difference between the at least four different
versions of the TB-303's circuit board?

There's been some corrosion on mine due to battery acid, and some of the
corrosion is between two copper pads.  I couldn't tell if the copper pads
were supposed to be connected electrically or not, so I went searching on
the web to see if anyone had a picture of theirs.

Well lo and behold, http://www.teknet.ch/tb-303/ress.htm has one.  I looked
at it, but one of the two copper pads in question wasn't even on his board! 
I looked at the part number for my board, and it is 291-502A, and his is
291-502D, and as an added bonus, all the schematics I've seen on the web for
the 303 were for 291-502C.  So if anyone has any helpful information on this
topic, giving me a hint, or several would be more than greatly appreciated.

-Thanks in advance-
-Justin Herrmann-

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