I arrived for a tune up for a blue shield member. I spoke with the homeowner and found that the air flow is still not to how they want it to be. I inspected the duct work and found the duct work to be undersized for the system. This is causing the air in the back bedrooms to have a lot more air flow than the rest of the house. I expect the situation to the homeowner and we decided to to leave the duct as it is for now until they decide to replace the duct.