Amana Furnace Condensate Leak

My Amana GUVAQQ115BX50 is installed horizontally in the attic. It seems to be leaking from the condensate drain inside the unit.

I understand that there is a heat exchanger warranty that is indefinite since I am the original owner of the furnace. I have also seen postings on the web suggesting that this is the case.

Any experiences or advice?

Thanks in advance.

The model is GUVA115BX50 – Sorry, don’t know how the typo crept in!