If you REALLY want to find it. Learn ALL the commands on the OEM remote to your JP1 remote. (You may need to do this several times if you run out of learning memory.)
Use the latest version of IR.exe with codeIR.dll copied to your Windows\System directory. Look for different sub-device numbers (we'll call that 128.xxx) other than 128.0 or 128.4 that dwg already tried. Then you will have to create a device upgrade for each 128.xxx and try all 256 commands. Of course you would start with any new sub-device numbers discovered first.
Here is the downside:
1. The commands may not exist
2. In testing all these commands you may reset or erase an EEPROM requiring a factory visit.
3. Even guessing that the device is 128, there are 8-bits in the sub-device and 8-bits in each function (aka OBC) so there are 65,536 (less the 512 dwg has already tried) possible combinations and if you could test one every 5 seconds it would take the better part of 12 work days to try them all.
4. The only Panasonic equipment I have is a 13" TV and an old VCR. So for my part this is all theroetical :-)
So, I am not really suggesting you try a whole bunch of commands. I would also suggest that you and the others that have this device really start to "bear down" on Panasonic. These things cost big $$ and if the discrete commands exist then someone there knows what they are -- if they don't, then "class action" litigation :-)
It is also worth posting on AVS forums if you haven't already, the answer may already be known there.
Here is the universe of all commands that I have ever seen posted for a Panasonic Plasma display sorted by device.subdevice (128.xxx) and 128.32 is the tuner and some of the others may be from European sets. The only other sub-device from the list below that looks promising to me is 128.36.
Under any circumstances I would avoid function 255 since it is the factory reset under 128.0 all functions below are OBC's NOT EFC's.
128.0 001 Input-AV/Video/S-video 005 Input-Next 006 Picture 007 Sound 012 Normalize 015 Off Timer 032 Volume-Up 033 Volume-Down 049 Surround 050 Mute 057 Status 061 Power-Toggle 062 Power-On 063 Power-Off 073 Action 074 Up 075 Down 078 Left 079 Right 082 Setup 122 Input-PC 212 Return 255 Factory Reset
