HMS 0700 2300 0002 0004 AMS unload

Had this error last night and just wanted to ask before i attack it.

Its talks about broken filament, ive looked briefly at the tube and its clear. ive taken out the bowden from the induction head and manually fed into the extruder and its feeds and come out of the nozzle….

My question

If it was the magnetic filament sensor in the extruder, would i still be able to feed the filament or would it not work ? im just trying to direct my efforts when i get time to a potential block in the buffer or elsewhere. i do have an HT fixed to that side, so may try load from that, this would then make me think its the AMS and not the buffer or hotend.

Thanks all