Maintenance was not on site on arrival. Tech signed in with staff. Tech investigated 500 hallway on arrival. Tech did not smell any electrical smell. Hallway is served by AHU 1, 2, and 3. AHU 3 is running normally. Tech found no burnt components. Blower and heat strips are amping correctly. Tech inspected ERV that is ducted to AHU 3. No burnt components found. It is running normally. AHU 1 blower and heat strips amped normally. Tech found disconnect for AHU 2 in the off position. Tech turned disconnect back on and blower did not start. Tech found 10uf capacitor reading very low. Replaced capacitor for testing. Tech confirmed failed 1/2 hp 1075 rpm blower. Tech also found bottom of heat strip contactor very rusty and indoor coil leaking R22. Tech does not recommend repairing 19 year old system due to cost and likelihood of it being low on R22. Cannot run test it without working blower. Contactor and blower motor replacement price would be $1261.67. R22 would be $161.92 per pound. R