Well, well, last night it happened again - the washer leaked! I noticed some water standing in the new drain pan. At first, I was freaked out because I just finished repairing the flooring. Then, I realized this was a double victory.
Victory #1 - the new drain pan and floor drain worked! It contained and drained any water that leaked from the washer.
Victory #2 - we now know what caused the previous flooding - it's the washer (not the drains).
Why the machine periodically spills its guts is still unknown to us but when it does, we are prepared. During the flooring and drain repairs, the washer was in the back yard and did not leak a drop, not even one, not even once. We need to repair this one or buy new.
Can someone resurrect the old thread about washing machine recommendations? I searched but did not find it. I found it - Speed Queen top loader about to be ordered.