i'd unplug the light and put a volt meter across the contacts and see what voltage you are getting at the light. if its battery voltage, the light is the issue.
if you arent getting full voltage, start moving up the circuit. the switch, connections at it, the fuse box, and maybe even the battery connections themselves. do your voltage checks with the lights turned on. a voltage drop needs power flowing to see the drop, a bad contact can read 12 volts, when off, and low or no voltage when power is "flowing".
for a 2021 203, the light is 25.00015, "light- blue led bulkhead livewell light".
its one of the "not pictured" parts in the catalog, so i am never 100% sure on those parts. i hate chaparall for having not pictured parts in its catalogs.
i know they also offer a two tone light. blue goes white as you toggle the power off and back on. seems to be an option, and i dont know where to get its part number.
and the newest models, the speakers light up too.