8 Foot Ladder is needed to Access 2nd floor Air Handler. Very High ceiling access. Upon arrival inspected air handler for 2nd floor air handler. Removed electronic air filter @ return to expose evaporator coil. Remove all door covers @ indoor air handler. Searched evaporator coil with UV light. Saw streak of dry on evaporator coil @ multiple locations. Air handler is 16 yrs old. Advising customer to consider replacement options. Searched Condenser. Remove fan motor. Cover condenser with blankets to create dark room effect to search interior of outdoor coil. Dry search for outdoor is inconclusive @ this time. Possibility of dye showing up @ a later time. Condenser is 15yrs old. Advising customer to consider replacement option. Customer would like office to provide quote for replacement of 2nd floor system View visual findings from this job here - https://visionshare.xoi.io/?id=XA-FA02-E4E2A3A47D4448198EB17770E4755200