In Kraus v. Ford Motor Co.(38 A.D.2d 680, 327 N.Y.S.2d 263 [4th Dept 1971]), where, following an automobile crash, plaintiff sent certain parts of the automobile to a lab for testing, defendant sought to examine the plaintiff's experts, the employees of the lab, not as to their opinions, but as to the nature of their examination and any changes in condition of the automobile parts as a result of their examination. The court found that defendant was entitled to examine plaintiff's expert as to the facts to ascertain if automobile parts that plaintiff turned over to expert were all the parts claimed to have been defective, whether they were all of such parts, and what if anything, was done to them by plaintiff's expert which may have altered them.