I had another company come out and diagnose the problem.
Turns out it's a faulty control board. The board makes the blower fan run constantly, even after you disconnect the t-stat. Also, no voltage is going to the inducer motor when the heat is called from the t-stat. And the status LED no longer lights up. The list goes on and on. The tech tested the T-stat terminals on the control board and said the t-stat was sending the correct signals to the control board. Kind of a bummer since the board was replaced this past summer. (do these control boards fail this often?) The company that incorrectly diagnosed the problem to be the pressure switch and then tried to charge me $550 to install it is the same company that now refuses to honor the warranty on the control board they put in this past summer. Nice huh?
Anyways, my plan is to swap it out for a new board tomorrow which I was able to attain. Does this board look wired correctly right now (see pics above)? Because I plan on plugging everything into the new board just like everything is plugged in right now.