A/C Line Set Problems

This purpose of this posting is to describe what happens when the A/C to a unit stops cooling as a result of loss of coolant. Recently we encountered this problem in a 1st floor condo in Countryside. The owner had a service contract with a well known company so we contacted them and gave them access to the unit so they could troubleshoot the A/C. They determined that the line set that carries coolant from the outside compressor to the inside air handler was leaking allowing the coolant to escape. They isolated the problem by cutting each end of the two coolant lines, sealing them off at both ends (inside & outside) then installing a pressure gauge on one of the lines. After this was done they pressurized the lines until there was 400psi in the lines. They returned a day later to see if the pressure was being maintained and it wasn't...it had dropped to 235psi indicating that the line set would have to be replaced at a cost of $4500! Why so costly? Normally they would have to run the lines up the outside wall to above the third floor through the wall into the attic crawl space, then down through the 3rd floor unit, then the 2nd floor unit then and finally into the 1st floor unit. When the owner told us the price that the A/C company had given him, we suggested that he get a second opinion which he did and they in turn confirmed that the line set was defective however they gave him a price estimate that was 1/3 less than the first  estimate  given. Instead of running the lines the way the first company suggested they decided to run the lines in a ditch underground, along the
outside of the condo, then up the wall (see photo #1) then into the condo, across the bedroom ceiling (see photo #2), then re-connect them to the air handler (see photo #3) all of which could be done far less costly than the first estimate. He elected to go with the more economic estimate and ended up with a significant savings. This line set problem, although not a common every day occurrence, seems to be happening more often as buildings and A/C units get older. The moral of this posting is to "always get a second opinion" and don't rely on the first estimate. 
Meanwhile we just added a photo below of what the bedroom looks like after the A/C line set was enclosed. Great job huh?