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TruTrak/Vizion no longer following vertical gudance

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Joined
Jul 7, 2017
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I've had my Vizion installed in my PA28 for over a year now and it suddenly stopped going armed/coupled after the IF.
Its slaved to a GPS175 and nothing in the install has changed in all this time. There have been no software or setup changes.
The GI275 and G5s all show the LPV glideslope just fine, but the AP, instead of cycling from "hold" to "arm" and then to "cpld" just says "flag" and goes sailing across the fix at the hold altitude.
GPSS works the same as always (and it still follows the G5 in that mode as well) and it passes the ground check for AIRINC and RS232 data.

Suggestions?
 

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