We have had the same thing and repairman said the same…They are coming out next week to service the heater…Will let you more when i hear after service call.
Thanks, Frank.
Thomas Glaze NACHI18080215
Hiawasse, GA.
Merry Christmas!!
Oh wait… 
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I am new to this thread but also just noticed the same oily fluid under my heat condenser. Has anyone found the root cause of this problem and a fix. I scheduled a service call but thinking about canceling as it sounds like there is no real fix from all that I have read.