All right, here is a list of EFCs, which were derived from learned signals from a Xbox 360 remote. Note that in a previous post, using a different list, that I said Enter should be EFC 170. The below list shows Enter as 090, while 170 is said to be the key 100.   Not sure which of these would correlate with Guide, but look at info, title, or DVD menu.
0 018
1 010
2 034
3 026
4 242
5 234
6 002
7 250
8 082
9 074
100 170
vol up 146
vol down 138
mute 066
ch/pg + 162
ch/pg - 154
power 050
enter 090
dvd menu 243
up arrow 194
down arrow 186
left arrow 019
right arrow 011
select 035
display 056
play 130
pause 210
rewind 106
fast fwd 114
stop 202
record 122
input toggle 098
next track 226
prev track 218
open / close 083
A / green 001
B / red 235
X / blue 081
Y / yellow 003
SILVER X 241
back 027
title 136
start 042
info 058
replay178