Performed yearly maintenance and safety checks on old air conditioning system could not find data plate or age of system, Qyntel system is R 22 system. Found multiple concerns including disconnect box fell apart upon attempting to remove disconnect coded HB7 for replacement disconnect. Customer chose option a. Replaced part. Cleaned system. 30/3 voltage absorption system reading 28.8/2.9. 17 degree deltat. Customer had mouse nest in ac. Cleared nest. Advised may want rodent deterrent to prevent damage. Corner of ac is missing fins advised typically associated with animal urine and to break any animal peeing on system.