Upon arrival customer stated that she was not getting any heat in the middle level. This is a two zone system. Home has 3 levels there is one room downstairs that has one duct that comes off plenum and goes to it. Customer advised me she had ac unit replaced last year September 2024. The ac and coil is new, zone dampers are newer, zone board is new. The gas furnace is 28 years old. After inspection of system found a numerous amount of issues with the system. When the upstairs system is calling for heat, unit will run for about 5 minutes and cut off on high limit switch. Found that blower housing was not properly in the rack all the way, the right side was not slid in properly to rack and left side was. There is also a gap inside cabinet where the heat exchanger and blower cabinet meet causing excess heat to enter cabinet and activate switch as well. There are a lot of air leaks at the plenum where duct runs are not connected properly to the system and sealed. The filter was pulled into