1504 BCU Fault. To check & rectify. ~~~~~ 1504 BCU unit healthy fault.  1504 FC 309. Swapped BCU from #2504 to #1504. Replaced #2504 with new BCU. Security/function check - OK.  Alan/Lee PT/Kamarul/Anand/Shafie 45256 BCU S/N : #1504 : 1808033 (from #2504) #2504 : 1745004 (NEW) #2504 : 1809067 (from #1504, faulty)