I went on-line and found some pics of manual. Here is one of just the EPG screen:
Attachment 26661
You can see a button for detail on the lower edge of screen.
The key to finding the code for guide is that month abriv followed by a period then 2 digit date and 4 digit year...
You can find it used in the first routine below:
84662C80 ; part of guide Month day "%s.%02d %s %s - " "%s [%02x:%02x]"
84663200 ; do the guide?
84663400 ; call to use guide
846633A0 ; loop using call to guide
846636A0 ; other use of loop guide
Odds are that the guide image you see is formed by using a structure that has an index number for the text "Guide" with numbers for the size, color and positioning--maybe a pointer or two for the handling routines to use (those pointers will be right around the 84663000 part of the code you see above). This for the nf_hd_v1.3sR_25 file.