How to cut rafters?

Here is the situation I have been presented with. It exceeds my experience level and need advice. please see the shared photos in this icloud link: [url]https://www.icloud.com/sharedalbum/#B0f53qWtHL7Yzk[/url] 3 All three vents you see here were done wrong by the previous roofer and a leak started between the two on the right (see pic) so all the shingles and 3 layers of old underlayment (first layer: ice and water shield, second layer: tar paper Third layer: Ice and water shield) was removed to check for plywood damage. FUN FACT: Its a 2/10 pitch roof so local code requires ice and watershield for the whole roof. We are using GAF WeatherWatch HERES THE QUESTION - what is the correct way to do the SIDES of the underlayment. Obviously, starting at the bottom, I lap the new underlayment over the old, (6" overlap) and then tuck it 6" under the top existing layer (which will be a total pain since the underlayment is aggressively stuck to the plywood) - but what about the sides? Nothing in the GAF WeatherWatch installation instructions covers a situation like this other than calling for a 6" overlap on adjacent sections - but this assumes a new install for an entire roof, not patching a large section. I might point out - re-doing the entire section of the roof isnt an option. Thank you in advance

In the following picture, you can see under the overhang by the front door. The wood appears to be warped and painted over. I believe I had someone suggest to me once that this might be caused because water was able to get through to it. He said it could be because there are these things that need to go between the roof and what you see there, which were not required in 1966 when the house was built. He suggested these things could be put in now. Do you know what he might mean, or how I could otherwise stop water from getting to this area? What kind of service would have the expertise to know for sure and could fix it? In the next picture is the channel or whatever on the roof above the door that is supposed to reroute the water away from that area so it doesn't spill on to the steps there. This channel is not doing the job. Any suggestions on how to fix this? I need a permanent solution? What service would have the expertise to know what I really need and be able to fix it right? Finally, the third pic shows how the roof forms a path where it joins together there for the water to flow down to where it goes over the roof onto the front door step. Is there anything that could reroute the water further up the roof there, or otherwise fix this issue? What service would have the expertise to fix this right? Ideally, I would like to have one service that could fix all these issues. What kind of service am I looking for? [attach]96234[/attach] [attach]96235[/attach] [attach]96236[/attach]