A:Answer Hi Sid- This is Sue at GE Appliances. We are sorry to hear of this unfortunate experience and certainly appreciate your loyalty! A trim kit consists of the trim frame, as well as an upper, lower, and rear duct that attaches to and encases the microwave inside the cabinet cut-out. It is important to only use the trim kit designed for that model. PEB9159DJWW is compatible with Optional 27" Built-In Kit JX9152DJWW and Optional 30" Built-In Kit JX9153DJWW. The only difference between the 27" and 30" trim kit is the trim frame. If the microwave is installed over a 27" or 30" wall oven, be sure to match the trim kit width to the oven. We suggest to view the Installation Instructions for cutout and clearance requirements at the following link: https://www.myapstore.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40762-1.pdf - Thanks for checking with us!