Harman P68 - Window gets black

[Harman p-68a]

I know my 68 s door was black and dirty with the timber heat pellets.I cleaned it yesterday fines box, motors , room fan , everything gave it a good going over and exhaust pipe, switched to my softwood pellets and it has been chugging away on low low for about 15 hrs now and still clean as a whistle so pellets were a big culprit for me the timbers are terrible dirty pellets to burn.. anyways happy burning all you oinkers

 

[Bioburner]

Is the fines box also on an xxv? I don't recall seeing it. Just want to be sure I'm cleaning my stove right.

Page 21 of your manual, figure 5.8 shows the feeder cleanout.