Yes, the left little tube (looked at from behind) is the PI tube for the left pair of power tubes (channel 2), and the right one is the PI tube for the right power tube pair (channel 1). The preamp tube in the middle is the input tube (for both channels).
Did you change the tube fuse for your 6L6 channel or did you just took a look at it? Sometimes a fuse looks good, even if it is not working correctly. So to make sure, you should try a good fuse for that channel or put the fuse of your EL34 channel into the place for your 6L6 channel.
The 212 REX Pro (with flexback) is an oversized 2x12 cab and may be sufficient for your needs, it would definitely be less weight and easier to transport :)
Wow that is an AWESOME suggestion man! You saved my life! :D
Now I can configure a standing up 212 with my choice of Eminence's (allways liked those more than Celestions) and purple snakeskin haha :D
I play Egnater dual modules. For cleaner SRV tones I prefer the T/D module (Twin/Deluxe) to the Bman module. I wouldn't use British voiced speakers. For the crunchier SRV tones i use the SL module (Plexi).