Hi, I'll send this to our association A&P for an answer. Note: This is a holiday week and it may take longer to get you an answer. Please be patient.
Wright Brothers Master Pilot, FAA Commercial Pilot
Aviation Director, Cessna Owners Organization Forum Moderator and Cessna Owners Author.
Need help? Let me know!
Here's the response from our A&P, Erich Rempert.
There should be two little tabs on the snap ring like this, pull them together with a pair of pliers and the snap ring will pop out releasing the light.
If the tabs are broken off (Many are) use a small flast blade screwdriver or a scribe (pick) to work one end out.
The lamp will fall out once the ring is removed so be prepared!
~Erich Rempert, IA Consultant