What was found
BOTH YOKE AUTOPILOT DISCONNECT SWITCHES DISCONNECT AUTOPILOT BUT DO NOT SILENCE AURAL WARNING OR THE AP/P-RST LIGHTS. AURAL WARNING IS SILENCED WHEN EITHER AP /P -RST SWITCH ON FWD INST PANEL IS PUSHED. ACFT GROUNDED. FOUND CAPTAINS YOKE AUTOPILOT DISENGAGE SWITCH BAD. REMOVED CAPT AUTOPILOT DISENGAGE SWITCH IAW MM 22-11-41-400-801. PERFORMED SWITCH INSTALLATION TEST IAW MM 22-00-41-400-801, PARA G. INSTALLATION TEST IS GOOD. A/P DISCONNECTS AND AURAL WARNING SILENCES WITH AUTOPILOT DISENGAGE SWITCH ON BOTH CAPT AND F/O'S YOKES.