Thanks for having me in the forum,... Lots of great info,... Just got a used 6039,... It's the model with newer control panel and the under-firebox damper,... It does not have plugs in the holes behind the firebox back board, It does not have the FAK installed, and the FAK inlet behind the firebox is capped,... I have been running the stove for 3 days now, usually on HR 4 with all other settings for combustion air, draft air, auger, and agitator in "A" (auto),... no apparent major issues or errors,... yet,... however,... I've been searching threads and manuals, etc, but I still have a few clarifications / questions,... Thanks in advance for any help and/or advice,... 1) What is the relationship between the FAK and the Manual Damper under the firebox? If I install the FAK from outside to the cabinet connection, and from there to the firebox, is that connection controlled or just wide open? Does the FAK installed negate the control of the manual damper? For those who mentioned a valve or butterfly on the FAK, where / how does it install? Thanks! 2) I opened the entire box to clean, inspect, and test the unit before running it for the first time,... there was large square opening around the agitator motor & mount with some insulation fragments. I see screw holes around the edge of the opening, but no cover - wide open. The room fan did not have much flow volume at the outlet, but there was a lot of flow from this hole. I searched but could not find any info or pictures for the cover that I think is missing. I did find one diagram that showed two-pieces of insulation, items 56 part #88121 Insulation Top Agitator; and item 57 part #88122 Insulation Bottom Agitator, but I still can't see a picture of what the items are. I fashioned a makeshift cover from a section of tin duct, but no insulation,... that improved the room air flow immensely,... But, is this hole supposed to be covered? If so, what does the cover look like, and where does the two insulation parts go? Thanks, again! 3) I have noticed that I have to remove the fire-pot and agitator and actually "chip" the build-up off the bottom of the pot and of the tines,... It doesn't seem normal,... the pot looks like it may have sat for a long time with residue in it that caused it to corrode and pit. Could that be causing the hard, crusty build up? Or is it something else with burn or air settings? Thanks so much! Where is the best place to get parts,... without taking out a second mortgage! Happy Thanksgiving!