Have you tried all of these:
0003, 0012, 0014, 0011, 0015, 0476
If so, have you tried doing a SEARCH (991 function).
If you've tried all of the above, call the Radio Shack helpline, tell them you have a 15-1994 remote ;) and ask them for the code (you will need to have the model number of your cable box handy). The number is (800) 763 9232
If you find a code, could you email it to me so I can add it to the device code list.
Rob.
[Link: stormloader.com]