First power up/calibration - Filament failed to load. Wrong idler position. Replaced springs. FILAMENT LOADS!
Thanks to whoever indicated spring tension causing wrong idler position. I replaced the Idler Tension Springs with a lighter spring and I seemed to be able to dial in the 'Sweet Spot' a bit easier than intimated by other posts. Not sure if this is the fix, but I have been able to calibrate first layer now (consistently loads filament).
Hope this helps!