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Hello Im Rob. A Certified Motor Technician in the UK. And will be advising you on your question today..
Sounds like a faulty expansion valve - if it malfunctions or fails to open while the AC compressor is operating it can cause dead-head senario at the compressor where the pressure builds in the high pressure hose and blows the welds or hose.. In that view your garage in this case should be looking at the Expansion Valve..hope this helps