Customer called in because of lavatory sink that was no draining. Ran water and found that pop up assembly was leaking, and sink was not draining. Removed existing P-trap. Inspected p-trap. Found that p-trap has build up of sludge. Removed existing pop up assembly. Installed new pop up assembly. Installed new p-trap. Load tested sink 10 times. No signs of leaks found at this time. Note: as a curtesy to customer replacement of P-trap was performed under no cost. Thank you for choosing CPI plumbing and heating!