SR-172W not cooling

MOST CASES ... THEY ARE NOT LOW ON 134A . TO TELL ... YOU NEED ONLY START THE COMPRESSOR AND HOLD YOUR HAND ON THE SMALLEST COPPER-LINE ... IF IT GETS REAL HOT 110-130 DEGRESS YOU HAVE A CHARGE. IF YOU MOVED THIS FRIG. AT ALL LATELY MAKE SURE YOU LET IT STAND UPRIGHT UNPLUGGED !!! FOR EIGHT HOURS. YOU CAN ALSO SPEED THINGS UP BY: HEATING WITH A BLOWDRIER BOTH THE COLD PLATE INSIDE AND THE BOTTOM OF THE COMPRESSOR ... THIS BOILS ANY REFRIGERANT OUT OF THE OIL AND LETS THE OIL RETURN TO THE COMPRESSORS OIL RESEVOIR THAT IS AT THE BOTTOM OF THE COMPRESSOR. THESE SMALL FRIGS ARE GREAT ... BUT FRAGILE TO MOVE AND DEFROST. OIL CAN GET TRAPED IN THE COLD PLATE AND NEDDS TO BE HEATED OUT OF THERE AND SOME UNFORTUNATELY USE METAL OBJECTS TO DE-ICE. A LOW CHARGE WILL NOT FROST THE COLD PLATE (EVAPORATOR)EVENLY AS IT SHOULD. LOW CHARGES (AFTER YOU HAVE DONE THE ABOVE) ... WILL ICE UP IN JUST A SMALL SECTION WERE THE PIPES AND CAP-TUBE GO INTO THE COLD PLATE. THESE DONT LEAK UNLESS SOMEONE TOOK A ICE-PICK OR EQUALLY AS DEVESTATING TOOL TO DEFROPST IT. ONLY WAY TO DEFROST QUICK IS WITH HAIR DRIER ...DO NOT PROP-IT UP IN THERE AND WALK AWAY .. YOU CAN MELT OR WARP INSIDE PLASTIC HOUSING !!!!! THEY ALL NEED MANUAL DEFROSTING THE MINUTE ICE STARTS ACCUMILATING. OR BUY A APPLIANCE GRADE HIGH AMP (10 AMP) PLUG IN TIMMER AND SET TO GO OFF AT 3AM AND COME ON AT 4PM ... ONLY 1 HR. IF THERE IS A VISABLE HOLE IN THE EVAPORATOR COLD PLATE ... IT IS ALUMINUM AND FORGET ABOUT EXOPY KITS TO REPAIR THEY ONLY LAST A YEAR IF THAT. IF YOU CALL TO HAVE IT REPAIRED RIGHT WITH SOLDER ... USUALLY A REPAIR LIKE THAT WILL NOT BE WARRANTIED AND PROBUBLY COST MORE THAN TO BUY A NEW ONE. GOOD LUCK.