Front-load Frigidaire FAFS4247LW0.... Machine seems to function normally until spin cycle. With approx. 7-6 mins left on timer, slow alternating spins begin ok, but never achieves/maintains a fast spin in any cycle/mode. Throws E58.
Followed tech sheet diagnostics and performed Test 8.
Motor and drum spin freely by hand. Motor pins 1-2, 2-3, 1-3 all between 3.2 -4.5 ohms. Pins 4-5 at 122 ohms. Drain sump and hoses clear. Pump seems fine, but some water is left in the lower sump hose after drain (no visible water remains in the inner drum, but if i squeeze the lower (black, corrugated) sump hose, a little water will splash up between the drum holes).
Changed motor controller - no fix.
Changed door lock/switch - no fix.
Is there any way to test the main control board output, pump cycle, and/or the level switch? I really don't want to just keep throwing parts at it.
Any suggestions for a next move?