Indeed there are!
I'd never ran the DM menu until today as I was fully expecting it to be in Japanese like the update (or whatever its called- the one you get by holding down 'OK') menu. Great to be able to understand what I'm choosing/ whats going on. I'm running the HDD bit checksum right now.
EDIT
To do this you must unplug the AC and battery, hold down D + M (Diagnostic Menu)
It must've took about an hour or just less to get a checksum out of it, but it doesn't seem to save it so you have to write it down. There is a complimentary HDD menu option to checksum from a txt file on a disc.
After that there are another couple of options, one being to run a HDD check. I'm about halfway through it now and so far its found 353 RANK A sectors and 160 RANK B- what does RANK B mean? Can these not be repaired?