The A/C shop I intend to use would not consider splicing the high pressure hose. Maybe someone else would do it but I trust this guy's judgement. I've already purchased a OEM fit replacement. I have no problem crawling under the dash to replace the hose. Just wondering how many curse words to save up for the job ()

I've decided to leave the expansion valve alone. I agree with Larry's comment. I stand just as much chance of messing up something else in the process. Since I have no prior knowledge about the condition of the system why pick that one compenent to replace? I'll replace the known defective high pressure hose, take it to the shop and see how it pans out.

Thanks everyone for your advice.