I usually do a visual inspection for oil, followed by a nitrogen bubble check on the fittings and listen for a leak, then I add some refrigerant and try to sniff it out… but sometimes I can’t find fucking anything. I end up isolating everything individually and pressurizing everything and coming back a week or so later to see where the drop is. Is this a decent technique or are there any other easier tricks because goddamn it’s getting frustrating with these hard to find leaks.