KPTW LOC 28 x 3 Leber PIC GFC 500 Coupled approach fails

UPDATE: This now appears to be fixed as a firmware bug: GI 275 Multi-function Instrument System Software Version provides the following updates: Fixed the issue described in Garmin Service Advisory 23053, where the Localizer (LOC) only approaches without a published ILS that do not have an approach course of approximately 360, may cause the GI 275 and GFC 500 autopilot to not track properly Three attempts at flying the KPTW LOC 28 while coupled with the GFC 500 and GTN 750. LOC drops back to ROL every time Another example at Flight data file as a spreadsheet at CloudAhoy at