I uploaded the instruction PLA:
www.seanriddle.com/merlininstpla.jpg

I also converted the fixed Merlin dump back to raw bit order and superimposed the bits on the ROM array picture, and didn't find any differences. Then I changed byte $96 from $1E to $5E and converted that file to raw bit order and I can see the extra bit. So for whatever reason, Kevin's dumping method added that one bit. It would be very interesting to figure out why.