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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
If it's anything like my truck I removed two screws pryed the panel off unplugged the hvac connector then there was two small Phillips holding a cover over the circut board I had three twist in style bulbs
Their is a detailed video on the disassembly to get to those bulbs on YouTube. Just search under Dodge Ram LED Dash light conversion. You can ignore the LED part but you will at least see how to get to the bulbs in the HVAC control.