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Help HTC Sensation repairing tomorrow: Help - Question

Hi there,
Excuse my ignorance here, I'm new to all this.
My HTC Sensation is in need of repairing. The video recorder quality is shockingly poor and the mic on the earpiece has broken. I can't hear callers, unless I put it on loudspeaker.
I spoke with HTC on the phone today and it is still under warranty so they are sending someone to collect it to repair tomorrow morning.
My question is this - obviously, I have some personal info on the phone but I was wondering, should I do a full factory reset on it before handing over the phone, to erase everything on it?
Or, would they need me to leave certain things on there, in order to ascertain what's currently wrong with it?
Any suggestions / knowledge would be greatly appreciated by this newbie.
Many thanks in advance.
Regards:

Echospace.
 

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