Ordered replacement diffuser; waited for replacement diffuser to arrive; removed diffuser from packaging; removed one hex head screw; pulled off plastic cover; pressed down locking tab lever on electrical connector then pulled connector apart; removed bad diffuser; inserted new diffuser; inserted electrical connector and made sure locking tab latched; positioned wires and electrical connector assembly; inserted hex head screw back into hole in cover maintaining pressure with nut driver so screw does not fall out; re-inserted plastic cover aligning screw in hole then tightening screw into hole; press cover firmly against side of interior; tighten screw finger tight (do NOT overtighten as you are screwing into plastic);