I had a little trouble removing the card cage. There are small metal levers on the corners of the cards to aid in removal. One of them was sticking up too far and caught the case. Fixing that it slid out easily. There are two 512K Apple RAM cards in this machine. It has a VintageMicros sticker on the inside dated Nov 07.
Let’s pop one of the RAM cards out and see if my rig throws the error 45 again.