Customer reported downstairs system still has dirty sock syndrome. Customer notices it most in the bathroom. Reported it smelling like gym socks or vomit. Tech could not smell a strong odor. Tech did smell a slight mustiness. Tech inspected air handler and duct system in crawl space. Plasma wave air cleaner is installed and powered correctly and appears to be functioning properly. Ductwork in crawl does not look as new as downstairs split system. Some substance growth can be seen on insulation liner inside supply plenum. Blower and coil look fairly clean. Tech gave customer the options of cleaning indoor coil again $183.74, installing UV light and media filter $1127.57, applying EXODOR treatment $137 plus tax, replacing older duct system, or getting quote on treated indoor coil. Caleb quoted customer duct system price over the phone. Customer declined all options. No housecall on premium agreement.