1. When you get the "adjust failure", do you have the coin door closed when you power the game on? If you open the door and then power it on, do you get the message "factory setting"? If you do not have acid damage and have installed new batteries, my guess is that you need a new battery holder. There are steps that you go through to determine if this is the case. I will try to find it and post it.
2. You need to rebuild that flipper. It is pretty easy. Sounds like it is binding. Check to make sure the wires are connected firmly.
3. On this one, loosen the four screws for the assembly and move it slightly. It is also binding. Find the right spot where it will move freely and then retighten the screws. It may take a couple of tries to get it right, but this is common for these types of assemblies.