Need some advice on my house.

I'm replacing the soffits, fascias, and gutters myself on our new (to us) house, and last night, just as it was getting dark, I think I ran into an "issue".

Picture of the back of our house taken this past spring below, and do you see those 6x6 (or 8x8?) posts holding the sun room and deck over on the right?

house.jpg

I can't say this with any certainty, but I think those posts have "kicked-out" a small amount (house was built in '96). Or at least that's what I think I saw last night (and I'll drop a plumb bob when I get home this afternoon).

Here's my question: If the footing for these posts has shifted (sandy, loose soil), who do I contact to fix this? A GC? A foundation specialist? A concrete guy? I mean, the entire sun room is going to have to be supported to fix this...if I'm seeing what I think I saw.

I can do a lot on a house, but not this.

Thanks!

Jim