Panasonic has faxed me two sheets one is for Plasmas and one is for pa20 and px20 series televisions. The sheets include:

1.0 Kaseikyo Format
1.1 Carrier Frequency fc=36.7 khz T=0.436 +- 0.03 msec.
1.2 Header <---------------8T----------------><---------4T-------->
1.3 Data 0 1
<-T-><-T-> <-T-><----3T---->
1.4 Trailer <-T->
<--------------------------172T------------------>
1.5 IR Codes for PA20 and PX20 series and new plasma
Custom Code Data Code
1.POWER ON 800 3D
2.POWER OFF 800 3D
3.TV/VIDEO 800 05
4.ASPECT 804 DE
5.INPUT 1 800 01
6.INPUT 2 800 02
7.INPUT 3 800 03
8.COMP 1 804 7C
9.COMP 2 804 7D
10.PC 800 7A

Maybe someone smarter than me can make sense of this information and post need codes.