Door release latch failed after 7 years of service Gerald B. • Belvidere, TN • September 26, 2014 Appliance: Model WHIRLPOOL MT4155SPQ-2 My Repair & Advice Removed the unit cover, discovered which plastic component had failed and ordered replacement part from AplianceParts. Part arrived in less than 24 hours. Installed the broken latch part and unit is back operating like new. Was this review helpful to you?