Customer called us out for a slow draining bathtub in master bathroom. On inspection I noticed it was a freestanding tub. The house was newly built and has only been lived in since January of this year. When tested the tub was very slow to drain. I recommended using a plunger to see if anything would come up first and if it worked treating the tub with endure. Customer agreed. I used a plunger for 10 minutes and nothing came up. Issue is most likely due to improper plumbing on either the trap or venting. Customer has a warranty on the home still and will be going through them to fix the issue. Customers water heater does not have a drain pan or an expansion tank either.