FLame EXtinguishment (FLEX)-2 Multi-user Droplet Combustion Apparatus (MDCA) Exchange: This morning, the crew was scheduled to perform a Fluids and Combustion Facility (FCF) MDCA replacement in preparation for the FLEX-2 experiment. The Crew was unable to remove the MDCA Chamber Insert Assembly (CIA) from the Combustion Integration Rack (CIR) Combustion Chamber. Ground teams will meet …