i have a dcc ready bachmann spectrum k4 4-6-2 what decoder should i use and also does this model come with a speaker?its the plain dcc ready locomotive.this is a brand new locomotive the tender seems to have holes for a speaker that may not be there. can anyone tell me if the new k4 462's come with a speaker.

i have a bachmann spectrum k4-4-6-2 dcc-ready.one of the screws in the tender has broken off and now i cant open the shell and install the dcc decoder.what should i do?  note the screw head has been chiped away over time,and  now no matter what i do i can get this screw out it just wont work with a screw driver any more