I assume by asking about "discrete" codes you meant you were looking for some functions that the device understands that aren't on the original remote, so you can't get them by learning, so you wanted to know if they were posted somewhere (apparently not).
Based on that same assumption, Makitamark sent you a set of 256 Pronto Hex strings to test.
You can use either Hex2ccf or irpanels to convert that set of pronto hex strings into a ccf file with numbered buttons for the 256 functions. Then merge/load that ccf into your pronto and test those 256 buttons to see what each one does.[Link: remotecentral.com][Link: remotecentral.com]
If you were looking for a discrete On command, you would need to test the 256 buttons with the device off to find the one or more functions that turn it on (function 89 is the power toggle. You want to first see if any function other than 89 turns the device on). Then if you find one, test the same function with the device already on. If, unlike 89, that other function doesn't turn the device off, it could be used as a discrete On.
To look for a discrete Off, you'd need to test all 256 (except function 89) with the device on and see which turn it off.
Other discrete codes may need other specific searches, so you might need to go through all 256 buttons several times.