I have pushed fixes for the box drawing characters, and for the incorrect forms of arabic characters. This includes fixes to IBM 851 and IBM 868, which were not part of your patch.
Many of the remaining changes suggested are a bit dubious though.
For example, in IBM 437 you proposed the following changes:
0xe1: GREEK SMALL LETTER BETA -> LATIN SMALL LETTER SHARP S 0xe6: GREEK SMALL LETTER MU -> MICRO SIGN 0xed: EMPTY SET -> GREEK SMALL LETTER PHI
Now, as is noted on e.g. http://en.wikipedia.org/wiki/IBM_437, the greek characters are used for multiple purposes. This means that a "correct" translation (i.e. one that captures the intent of the document author) needs some kind of context.
If we ignore this fact, and just look at what IBM has defined these code points to be, we find (ftp://ftp.software.ibm.com/software/globalization/gcoc/attachments/CP00437.txt)
E1 LS610000 Sharp s Small E6 GM010000 Mu Small ED GF010001 Phi Small (Closed Form)
Looking up these GCGID:s in http://www-01.ibm.com/software/globalization/gcgid/gcgid.html, we find
LS610000 Sharp s Small U00000DF LATIN SMALL LETTER SHARP S GM010000 Mu Small - (resembles SM17) U00003BC GREEK SMALL LETTER MU GF010001 Phi Small (Closed Form) U00003C6 GREEK SMALL LETTER PHI
So the change for code point E1 and ED is according to the authoritative source, but the change for code point E6 goes against it...