Wheel slip/slide permanent indication since DBG SB. Wheel slip/slide permanent indication since DBG SB. ~~~~~ 3551 Wheel slip/slide permanent indication since DBG SB. Wheel slip/slide permanent indication since DBG SB.  3551 Checked P1 & P4 connector - OK. Replaced BCU unit. Wheel diameter setting 808mm. Brake cyclic test, limited movement & depot shunting - All OK. BCU Old: 1813105 New: 1814119 Sarma/Alan/Lee PT/Anand 44946