garage foundation

Here is my situation and my solution after talking to a million people and reading what I could find in this forum. My 10x18 "shed" had studs and floor joists (all 2x4s) resting directly on cinder blocks which had sunk below grade over the years (since before 1977) and were rotten to the point...

I have a house built in the late 40's with an attached garage on a block slab. The garage sits on the slab with wood footers on three sides that are severely rotted and the bolts holding the wood to the blocks are rusted or have disappeared. How do I replace the wood footers and can I replace...