I have an AD40USR1 model that is probably about five or six years old. The unit is running but very little water is in the bucket. It's condensing, but not a lot. I took the front off (the part attached with 6 screws) and thoroughly vacuumed the metal filter (or condensor?), which was filthy. Will this fix the problem? I could find no other filter or screen to clean. Have I missed something that will help draw the air in, or do you think the blocked filter or condensor was my problem?