Continuing the F3 audit. VERIFY.php's SYSTEM DBs check had the same retired-code map found and fixed in CHECKPOINT.php/PLATFORM_CHECK.php/HISTORY.php/SOLVE.php this same investigation -- except doubled: $sys_dirs mapped retired code to dir, then a SEPARATE $dec_map inside the foreach loop mapped retired code to decade AGAIN, both containing the '10 trap.' Also found a correct, entirely unused $decades array (real decade codes) sitting right next to the buggy pair -- looks like an earlier, abandoned attempt at fixing this that never got wired in. Replaced both maps with roster_lib.php's build_roster(), iterating directly over its decade-keyed entries.