Hmm, it sounds like the P board isn't delivering the 6 and 7 Volt supplies for your relay.
The part number for the P board is -- N0AB3GH00003
I had some problems Googling the part number...ended up getting a whole bunch of German showing up.
So I went to Encompass --
Copy and paste the part number I gave you into Encompass's Part search box.
That is really the only place that sells the part. Usually you can find 3 or 4 suppliers of Panasonic parts, and I suspect the SIZE of your TV set is the reason why there aren't a lot of suppliers. I suspect the parts and the cost of the TV set may be too close to each other.
Anyways, if you remove the back cover here is a picture of the P board and it's disassembly --
Pretty simple to replace, hopefully Encompass will get the board restocked.
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Tips are greatly appreciated !