Drain pan had a bunch of snot like buildup, homeowner was wondering why it would happen so soon again & mentioned because of the build up inside the drain pan. Cleared out the drain pan with vacuum & then purged the line with nitrogen to ensure it was cleared properly. Removed a 90 pvc fitting & replaced it with a pvc tee & stack & cap. Mentioned he could pour a mixture of vinegar & water every time he changed filter & it was draining properly after doing so. No other issues to report.