I guess the "fix-it" spray refers to Nu Calgon's Easy Seal. It supposedly works for very small leaks but not for bigger ones. There is also the concern that it may gum up the metering device, which is probably what the "jacked up" comment refers to. I would only use it as a temporary solution on a system that is on its last leg, to get a few weeks/months of service out of it until I am ready to replace it.
Short in the system is a concern though, it is usually not just shorted wires. It could be a number of things, the worst of which is a short in the compressor which would require it to be replaced as well ($$$).
$1,400 does not sound terribly high for a proper repair - replacing the evap coil, flushing the system, pressure testing, evacuating and charging it, AND fixing whatever the short is. However, if that unit is as old as the home (10 years), it may make more sense to just replace the entire system.
It's expensive, I know. So expensive that at some point I got fed up, signed up for a HVAC training in the local vo-tech, and got EPA certified. The first system I replaced myself more than paid for all the training costs I incurred :)