What was found
IN FLIGHT WE GOT A CYAN R PROBE MON FAIL MESSAGE, WHICH THEN TRIGGERED THREE AMBER CAS MESSAGES: R AOA HEAT FAIL, PITOT 2 HT FAIL AND STBY PITOT HT FAIL. THIS ALL BEGAN WHEN THE HBMU 2 CIRCUIT BREAKER TRIPPED ON THE EMS-CDU. T/S SYSTEM, REMOVED SUSPECTED HBMU FAULT REMAINED. REINSTALLED HBMU. ALL WORK IN REF. TO AMM 30-31-01. T/S SYSTEM FURTHER, FOUND #4 SPDA AT FAULT, REMOVED FAULTY #4 SPDA (P/N -1705836B S/N -2022). AND INSTALLED MODIFIED UNIT (P/N -1705836B S/N -1506). OPS CHECKS OK. ALL WORK IN REF TO GL-6000S AMM 24-62-01.