...
Ran detCheck's dumpIds application to compare the output using xmlGeoDbs v1r39 v1r39p3 against v1r40 (contains changes for side tile shingling). The initial output provides a count of materials, constants and detectors - the only difference between that portion of the output is in the number of constants. It is now 771 rather than 753.
The rest of the output is volumeIdentifiers - performing a diff on the output shows that the only changes are to the side tiles and demonstrates that the build order of the side tiles has changed from bottom to top, now to top to bottom. This is confirmed by Joanne. A visual scan of the dumped Ids suggests the volIds are as they should be and that the placement and dimensions of the side tiles has changed in a sensible way.
Next up: Modifying side ribbons to follow contours of new side tiles.