Train doors not proven closed at rear M1car. TC opened and closed train doors once to clear fault. Fault recurred at DBG2. TC opened and closed once to clear f ault. ~~~~~ 1513 Train doors not proven closed. TC opened and closed train doors once to clear fault. Fault recurred at DBG2. TC opened and closed once to clear fault. CE : T223-1513 all Train Doors Proven Closed. Depot 1513 train door operational check.  513/514 ER D/L at #3514 leading cab. Found fault occurred at M/L 2x. Checked/found #1513 B1/B2 both LHS door rollers badly pitted. Checked #1513 all 8 pairs of saloon doors for FOD - Not Found. Weather strip & door sensing s/w checked - OK.    OPS 20 raised to replace door rollers.  Au TK 44991 To c/o damaged door rollers.  1513 B1/B2 LHS door rollers replaced. Security/function check - OK.  Alan/Lee PT/Shafie 44991