Capt Pit Bull,
Seized engine core seems a bit drastic, I would be looking at a sheared EDP drive shaft first (then again engine instrument parameters and aircraft handling will obviously alert you of a seized engine).
The only accumulator I can recall on the 737 is the Sys B BRAKE SYSTEM accumulator for Brake System ONLY.
No accumulators for either Hyd Sys A or B that I can recall. Please correct me if I am wrong.
Rgds McHale.