The top picture? Are those the last screws holding the base plate??? (after removing side screws).
There's no heat at all now, it just worked for one cycle & a little bit for the second, then cut out & leaked out NG while it was running. I'm guessing there's some safety solenoid because there's been no more gas leak, but also no more heat. Not an intermittent problem, if that's how you understood it.
Sorry if I'm not making any sense, cars are easy to work on, this thing not so much.