Piper ARCHER II Pilot Operating Handbook page 252

SECTION 3A —- NON-NORMAL PROCEDURES
AUTOPILOT ABNORMAL DISCONNECT
(Red AP in the G5 or G3X autopilot status box, continuous aural disconnect tone.)
The autopilot disconnect may be accompanied by a red AFCS in the autopilot status box,
indicating the automatic flight control system has failed. The flight director will not be available
and the autopilot cannot be re-engaged with this annunciation present.