Responded to a no-heat call on Roosevelt Ave in Marblehead, MA, where the homeowner reported inconsistent temperatures across the 2nd and 3rd floors. One heating zone did not rise above 65 degrees, while other rooms dropped to nearly 50. The home has two gas-heated zones, and the uneven heat suggested a system or distribution issue. A full diagnostic was performed to identify the cause and begin restoring proper, even heating throughout the home.