Y axis alignement, again

I too have had Y-axis shifting issues but I found yet another reason. The X-Y belts were touching in one corner and rubbing, causing extra friction. The only way to fix this is to loosen the 16 bolts holding the main panels together at that corner and slide the side panel upward. There was a small gap in my panel’s interlocking tabs that allowed this. Now it’s printing better than ever.