During PM , 3557-BCU speed probe 4 fault ~~~~~ During PM , 3557-BCU speed probe 4 fault     #3557 measure tacho 4 impedance 32ohm. Replace tacho 4 and check ok. #3557-Tacho 4: Old s/n: 87066  New s/n: 1433299 Not: 2292960 raise to RSW. Done by Imran/Haikel/Haffiz. 08/07/21