Dishwasher leaking - any idea why?

Dishwasher is leaking, a LOT. I'm hoping I might be able to find out why, in the hope that I can fix/replace whatever it is myself.

It's a diplomat ADP8102. NO idea how old, it was there when we moved in 6 years ago. It's leaking from both corners at the front (half a litre from the left and 1.5 litres from the right hand side, per cycle).

Video below:

http://vid20.photobucket.com/albums/b206/reaper_2/IMG_3633.mp4

I've replaced the door seal gasket (before I took the front off..I didn't think it was so bad at that point) but made no difference.

Any ideas what the cause could be?

Thanks

Have a close look at the lower spray arm,they tend to split at the side seam on that model pushing a jet of water out sideways breaching the lower lip and door seal just like your video.

thank you. I have just taken thespray arm out; could see hairline cracks either side but no actual holes that water could escape from (other than the holes that were meant to be there). However I then attached a shower hose to it and water is coming out sideways as you described.

Hairline crack is what happens,get another spray arm job done.