See post 25 of this thread where I described DecodeCCF, IrTool and DecodeIr.dll

Those take long Pronto Hex and convert to a concise form. That form is basically the same as the input for MakeHex.

That concise form not the same as short Pronto hex, but if short Pronto hex exists, it is easy to convert from the concise form to short Pronto Hex.

It is very unlikely that short Pronto Hex exists for the the signals of a Pansonic TV.

But several people have used MakeHex to generate a few full sets of 256 codes for Panasonic TV (Those TV's unfortunately use signals from more than one set of 256) and have tested all those signals and reported results here at RC or at hifi-remote.com. You should do some more forum searches before attempting such tedious testing yourself.