What was found
(CAN) ON DECEMBER 04 AIRCRAFT HAD THE ELEV PITOT CAUTION LIGHT ILLUMINATE IN FLIGHT. THE CREW PERFORMED AN AIR TURN BACK AS UNDER THESE CONDITIONS THE FOM RESTRICTS OPERATIONS INTO ICING CONDITIONS. MAINTENANCE PERFORMED TROUBLESHOOTING RESULTING IN THE REPLACEMENT OF THE RH ELEVATOR PITOT PROBE (PN 0851HT-1) AND THE AFFECTED CIRCUIT BREAKER (C237 ON P18-9 PANEL). THE SYSTEM WAS TESTED SERVICEABLE AND NO FURTHER DEFECTS WERE REPORTED. FURTHER UPDATES WILL BE PROVIDED WHEN TEARDOWN INFORMATION IS AVAILABLE ON THE PITOT PROBE. AS ADDITIONAL INFORMATION, ON THE PREVIOUS FLIGHT DEC 03, THE FLIGHT CREW HAD THE Ï¿½R ELEV PITOTÏ¿½ CAUTION LIGHT ILLUMINATE ON THE RECALL CHECK DURING TAXI OUT. THE AIRCRAFT RETURNED TO THE GATE WHERE MAINTENANCE PERFORMED THE FAULT ISOLATION TASK FOR "R ELEV PITOT LIGHT ON" AND REPLACED THE PITOT HEAT CONTROL PANEL (PN 233A3201-2) AND THE SYSTEM WAS CHECKED SERVICEABLE.