the problem will come back, this was an three phase warrenty issue with trane, they did work on their Larger corp clients, ie Lowes, Home depot, and some others, I do recall that Costco REFUSED to allow free warrenty work.
I spent two years on the road, La to Miami, To chicgo, To New Hamp.
and until We did this the problem returns to the unit, average time table was 12 to 18 months, depending on climat and seasonal usage, I had some units in Phoenix that were 9 months old, fresh out of the factory line, installin in sept of 04 qnd in feb of 05 they had failing superheat numbers.
the pass fail SH chart, the temp range we were given was ( +0:-5 ) degress total, no maybes was their call,this chart is 11 x 17