I have a LENNOX ELITE 90 gas furnace. I have noticed inside where you take the front door off a small amount of water on the flat surface. In fact the flat surface has surface corrosion in different areas. The unit is about 8 years old and works great. It looks to me like its leaking down from the combustion fan motor area.

Any advice would greatly be appreciated......

Sincerely,

mam2nite