I would say the roof was torn or the seal under the AC unit at the curb was not done correctly at the time of build. Look at the getting the roof done by one of the two big company's that do spray on roofs , they can help you with the wood repairs also. One of the company's is in Florida .
Its sucks the factories don't do a better job on QC , many owners have issues that could be prevented .
Mark & Melissa
2015 Redwood RL38 , Kodiak disk brakes , 17.5" tires , 8K Morryde IS