I submitted errata on this, but haven't seen a response, so I'm trying here.
Page 239 of the current printing of Tech Manual lists a capacity of 28 troopers in a 5-ton bay. But pages 145, 147 and 155 together suggest this value should be 30, at least for Foot Infantry. Jump and Motorized bay capacities may warrant revision to align with pages 145, 147 and 155 as well. I believe Mechanized Infantry bays are already aligned. As I recall, the table on page 155 was added via errata some years ago, and while the Transport Bay table has also seen several revisions in errata, I don't believe any of them were coordinated with the change on 155.