3503 During PM-Found Speed Probe 4 Failu ~~~~~ 3503 During PM-Found Speed Probe 4 Failure.  3503 ER D/L & found FC 327 (BCU Speed Probe 4 Fault). No WSP was triggered at time of fault occurrence. Replaced BCU with GEN 2.1 type. Security/Function check - OK. To be monitored further during M/L service. 3503 BCU S/N : OLD : 1745014 NEW : 1812100  Solihin 44085