Unfortunately my CRP-5 is at work, so I cannot confirm figures, but I can tell you how to solve the problem.
ISA at 30,000 is -44°C.
Find the Mach number index in the 'Airspeed' window of the CRP-5, and align with -44°C
Read from Mach 0.84 on the inner scale to TAS on the outer scale.
Find that TAS on the blue 'temperature rise' scale in the middle of the CRP-5 (it is calibrated TAS against temperature rise) and read off the appropriate ram rise
Add the result to -44°C
All the best
Send Clowns
Gen Nav instructor
BCFT