Metallic creaking

truth1

Hi sorry if this has been asked before. I just wanted to see if anyone can work out what this metallic creaking I get on my bike is. It only happens when I lean over hard to the right but it sounds awful. I took it to my local bike shop and had what they call a silver service but they couldn't work out what is causing it either. It come from around my front wheel. The wheel seems to be true and everything seems tight and in working order. The rotor doesn't seem bent either. Any ideas?