There is an error in a health record that has been subpoenaed

There is an error in a health record that has been subpoenaed. This is a good-faith error and should be corrected. It has to do with the information the plaintiff is interested in and could be damaging to the defendant–physician if changed, but also damaging if unchanged. The physician asks you to blot out the error, write in the correct information and put the paper, with surrounding papers, through the copy machine. What do you do?