I have a Bachmann Spectrum 2-10-2 with DCC decoder, item # 83301, no sound, which has run erratically (loping forward and reverse) since purchase.  Sending in to service did not help, as they could not identify the problem, and sent back the loco.
It is possible that disengaging BMEF CV on decoder can solve the problem.  Is there a decoder manual available online on the decoder Bachmann installed on the loco with CV info, or does anyone know what that CV is on Bachmann's decoder?  Thanks, DickW