I cited these documents quite a bit on the forum years ago when discussing ASW. Just looked again to refresh. The inspectors were highly technical, but also a bit gentle in describing just how horrible Japanese tech was in comparison to the Allied navies'. In one portion, possibly the one you read, they state that the packing boxes for spares were perhaps the best part of the whole arrangement. Individual wooden boxes with form-fitting slots lined with felt for each tube and winding. Reminds me of how they pack melons for sale. OTOH, their screwdrivers and pliers broke with limited use, and their sonar shacks were lined with wood (!!) to allow access to wiring. There were no anti-chafing measures for bulkhead penetrations. And the sound heads on their echo-ranging gear were described as massive due to their inability to produce quartz strips to the proper tolerances. Which was OK as the installations often flooded and had terrible access for repair. Reminds me of that old Borscht Belt joke about the food at the deli.
In the electronics summary section the teams wrote that Japanese electronics were at about a 1935 Western level of tech at the end of the war. Their gear was huge, but generally worked OK in Japan and the drier parts of China. But field reports that it was unsuited for most of the PTO didn't make it to the labs until 1943, and new designs were never produced before VJ Day.
We often hear players state that "if only" Japan had convoyed they would have stymied the Allied submarine offensive. "If only" they had built thousands of 25-knot, fully-sonared escorts, all would have been well. This series of documents are required reading for those players.