i want to send my ipod touch back to apple for service....i have a super slowww wifi connection...i called my cable company and replaced my router 3 time.... i wanted to know if the technicians at apple will know if i opened my ipod touch and replaced the digitizer? if they do know....how do they know? does the digitizer have a serial number? or maybe a different cable? they look exactly the same to me... SOOO How will they know?