I have a 16 year old Trane XE900 outdoor unit coupled to a indoor gas heat furnace in the attic(not sure of the manufacturer but I assume thats also a Trane unit) .The fan in the outdoor unit is not turning but compressor is still working. The blower fan in the inside unit is working but the cooling efficiency has gone way down. The indoor temp is not coming down to less than 80F. I assume the condenser fan motor is dead as the rest of the system is chugging along.If it is the motor, can it be replaced easily? I am not a techinically trained person but I do have a good understanding of set-up. Any help will be greatly appreciated.BTW I am a newbie to this forum.