RE: Twin Electric Motors BIG PROBLEM
It doesn't make sense to seal any electronic in. All electronics should be accessable just for suck an occassion.
Does the motor than doesnt repond work at all?
Make it is hitting something.
If glue was used to seal it maybe it was glued to fusealge.
Is ESC in same compartment as motor?
Maybe motor wire wedged between motor and plane.
and so on......