The 'condenser' you saw is actually the condenser, and it sits under the drain pan, not in the cabinet. The Yoder loop running thru the cabinet is there to prevent sweating during periods of high humidity. Since there is no external fan, you have sealed system problems.
In service terms this is an "inefficient" compressor. You can try recharging the system to see if it holds the charge for a few months. If not, there may be a leak inside the cabinet somewhere that cannot be fixed. There is a Yoder loop repair kit consisting of a heater wire much like the crankcase heaters on A/C units, but it is difficult to install and requires special tubing fittings to accomplish. A re-charge may do the trick temporarily, but damage to the compressor valves may have occured during the periods of having the door open with the light on for more than 24 hours.