Too easy
On our 380 (Year 2000) we wanted lower wattage so it could be more mellow in the stateroom and over the dining table. Our lights have flat round glass lenses inside a smooth round plastic outer "ring that has no apparent screw holes or clips or anything. On ours the ring is actually a friction fit and pops off. I pry it a little away from the headliner with a razor knife and then insert a flat screw driver to avoid buggering up the edge. They pop off.