Thanks all! Your input is truly appreciated.
The panel safety switch was already zip tied down (by some tech, I guess).
Light code is showing 21 green, to one red.
Sogtx, pics much appreciated....
Your arrow appears to be pointed to the limit switch (see my pic for reference). It has two wire leads going to it (not one, as a flame sensor would have). It appears slightly offset in my pic because the two holding screws are removed while I examine all this.
https://www.amazon.com/SWT1612-Trane-Furnace-Replacement-Switch/dp/B00FEM56CGhttps://hosting.photobucket.com/images/y175/Cometstorm/IMG_7603(2).HEIC360view might be right.
I've been all over this thing and just cannot find a flame sensor:
https://www.amazon.com/gp/product/B00ECEENHG/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
