Pipe boots in bad shape on a cabin in Sevierville TN

The pipe boot on the electrical pole going through the roof is shot! Was probably leaking in the past due to all the old cracking roofing cement on it. Plus the screws are backing out as well. Same goes for the pipe boot on the plumbing vent. Its old and covered in roofing cement. It also needs to be replaced   

Here is a picture of the plumbing pipe boot that looks as bad as the other

Very loose roofing panels at lower transition.