(a) Subsequent Remedial Measures. When, after an injury or harm allegedgly caused by an event, measures are taken that, if taken previously, would have made the injury or harm less likely to occur, evidence of the subsequent remedial measures is not admissible to prove negligence, culpable conduct, a defect in product, a defect in product’s design, or a need for a warning or instruction. This rule does not require the exclusion of evidence of subsequent remedial measures when offered for another purpose, such as proving ownership, control, or feasibility of precautionary measures, if controverted, or impeachment.
(b) Notification of Defect. A written notification by a manufacturer of any defect in a product produced by such manufacturer to purchasers thereof is admissible against the manufacturer on the issue of existence of the defect to the extent that it is relevant.