Read an interesting article on The Psychology of Problem Feeders: Get Your Ball Python Eating Again.
Took the advice from the article. Gave the decor and enclosure a thorough cleaning. For the terrarium, first soaked it down with water. Then rubbed every surface and little nook with Jurassi Mite. Left it on for a while then rinsed off. Next, used Healthy Habitat to sanitize and deodorize. Then rinsed thoroughly with a lot of water.
And instead of the usual coco husk substrate, tried paper towels. Then I changed up a couple of hides to give him different options.
Returned Mr Burrows to his newly detailed home and left him alone for the night and next day. Then finally after fasting for 20 days (!), he took a weaned rat.