Upstairs unit is not cooling, did a complete evaluation of AC system. Found refrigerant pressure is low which means there’s a leak in the system. Did a complementary electronic leak search and could not find where leak is coming from. Also contactor is burnt annd pitted and compressor has high startup amps. Recommended doing a leak search with UV dye and adding 3 pounds of R410 a refrigerant, replacing contactor, And installing a hard start kit to reduce compressor amps, however, system is 8 years old and recommended replacing due to age and cost of repairs. Client needs to discuss with wife overnight and will get back to us.