We purchased our small 1943 cottage-style home six years ago and we have had very few problems until recently. We noticed our wood floor squeaking more than usual so I entered into the crawl space to have a look from below. From the crawl space I noticed there is water damage to the sill plate (just the length of doorway), header and some of the support beams at every door (3). Any advice and help would be greatly appreciated. My questions are: Is it possible to replace only the rotted section of the sill plate? Would the house need to be jacked-up to replace the sill plate? Should the damaged portion of the header be replaced or just reinforced with another 2X6?