To access them, you would need to:
1. Remove the transmission. This is a major job requiring significant mechanical skill and specialized tools.
2. Disassemble the valve body. This also requires specialized tools and knowledge of the transmission's internal workings.
Unless you're experienced with automatic transmission repair, you should take your Camaro to a qualified transmission specialist or mechanic for diagnosis and repair. Trying to access and replace the solenoids yourself without the necessary expertise is likely to cause more damage.