Customer has 7 y/o 3-zone Lennox system that operates for whole house. Air handler located in attic. Initial issue was main level damper not operating properly. Noticed that damper adjustment did not allow damper to close fully. Adjusted damper control. However, noticed that basement damper motor is inconsistent. Water protection is poor. Recommend UV BlueTube to target and prevent biological growth. Informed customer of findings. System is currently working.