Neal, I would definitely prefer an easier solution (who wouldn't), however I understand what you are saying and why you suggested it. Its definitely above my pay grade and comfort level. Also you are not the first one to suggest cutting off the deck joists and adding a support beam outside.
Bridgeman, if you have an alternative easier solution I am definitely open to it. And I don't entirely understand lintels myself, but it appears to me that this one is just steel angle holding up the brick around the window.
I really appreciate, everyone taking so much time to help me with this issue. Regardless of the end solution thanks.
I am planning on a temp solution of snugging up 2 screw floor jacks under the 2 joists - which are also nailed to the deck joists. I think this should be adequate support until I can find the right solution for me, or until I can find someone that can implement neals solution.
While I now understand what is correct and ideal, the house has been there 20 years, with very little deflection on the sill plate above the window, so something is holding all that load.