3677 DC reported brake fault(Stuck brake ~~~~~ 3677 DC reported brake fault(Stuck brake) during train prep.  3677 ER D/L - Done. Replaced 3677 ACU. Brake pressure test - OK. Air leak test (0.2 bar/5 min) - OK. 3677 ACU S/N : OLD : 1543-082 NEW : 1451-025  Selvan/Lee PT 43978