The deck on the back of my home was not completely taken care of and is in need of some repair. Some boards will need to be replaced. For those boards remaining, can I sand the surface to "resmooth" the boards for refinishing rather than replace them all? Also, one section of the deck has sank slightly with the ground (problem corrected) and has caused some of those boards to warp. Any suggestions on an easy way of bringing that corner back level with the rest of the deck so those boards can be replaced? Any recommendations on refinishing the deck once the reapirs have been made?
You don't say what the finish on the existing boards is/was or the type of wood on your deck. So, I will make a couple of assumptions in that it is pressure-treated wood and that the majority of the finish has worn off. You can certainly sand down the existing wood, using a good pressure washer after sanding will work wonders as well.
Without more information about the "sinking", the "warped wood" or the way your deck was constructed it's kind of hard to make suggestions - Is it built using post & beam construction? If not, how is the frame tied into the posts? How high off the ground is the deck? How much are the boards warped?
Once you get everything repaired/replaced, your best bet for finishing it is to use a solid coloured stain. You can get quite a variety of colours and you'll be able to match it to your brick/siding colour quite well. Any good paint store should be able to help you out.