I DSO'd 2 zappers
The cheap and nasty Ross sat TV one that is easily corrupted by others and
easily corrupts other kit
for power button
91111111311414111
for 1 button
91111111136121111
so looks as though a lot of variability over the length (7x1 and 8x1 after
the 9) is something to do with non-uniqueness

The JVC PVR zapper that I could not crack via 3 or 4 "universal" is , oddly,
much simpler
DVD power button
1111212125
1 button
111121253
6 button
1111213133

so seems to be just 111121 then permutations summing to 10 ,for the DVD side
anyway