OT Sony PVV3 assistance

Does anyone here have a service manual or know how to replace either the fuse or is it a circuit breaker for the sony betacam PVV3 back.

On a 5 its external, but it must be internal in a pvv3. Any assistance would be appreciated, and sorry to be off topic, but I have a shoot on Tuesday and I would like to try and fix it if possible.

The owners manual only mentions the circuit breaker, but I have heard there is a fuse. Its a power input that caused the problem, reversed, ikes, but thats why they have fuses isn't it.

If you know of another board that might help that works too.

thanks

Lonn Bailey soc