My company was recently informed by our vendor for our product bottles that the manufacturer had changed resins 3 years ago and did not notify anyone. And it’s not as simple as replacing resin A with resin B. They were replacing it with different kinds of resin. We are fully aware that we need to cover our bases on this issue. We were given the Part numbers along with lot numbers of bottles that are in question. So we have personnel export data for these lots. We are pretty much at a loss as to how we can resolve this or where to even start. Does anyone have suggestions on how or where to start? Manufacturer has currently stated that they do not have any background studies on resins used.