EM coils usually (not always) give indications of being bad, such as a dark brown burnt appearance, melted bobbin, cooked paper wrapping. I haven't done a Bowler yet but the principles are close in all EMs. Sounds like the motor is under load and can't turn or a short. Manually spin the motor with a wooden stick to ensure it is free.
Look close at all solder joints, sometimes the tabs cross one another and short.
Check that all mechanical linkage in back is free. Look for crossed wires or disconnected wires that could touch where they shouldn't.