I am trouble shooting a spa light non-op condition in a Sundance Sentry 724. When the "light" button is pressed on the control panel, a "click" is heard (sounds like a relay functioning normal), but the light does not turn on at the bottom of the spa. I would like to go with what I think is the most likely cause, and replace the bulb. How would I go about accessing this bulb? Do I have to drain the tub and take the front cover of the bulb housing off, or is there access from the outside behind the wood frame and insulation? Thanks for your time.

The bulb and socket housing is located in the front panel, behind the pump, and at the end of a 2 foot long, narrow access tube. A special or self fabricated install/removal tool for the bulb socket housing may be necessary if your arm isn't long enough to reach it.