This 21 year old home in Mesa, AZ had a number of roof leaks. Upon inspection of the underlayment, it was found to have deteriorated beyond just a simple repair. The solution was to remove the tile, place new underlayment and replace the tile.
After a big rain storm, this roof had a leak over the rear family room, causing water damage to the interior of the home. Sealing a few roof penetrations and laying new underlayment under a section of the roof solved the issue.