Leak from light conduit. (Junction box is 12” higher)

You can probably leave the pool lights on this junction box and just replace the spa light if there is not enough line slack to extend the spa cord to a higher junction box.

One problem will be how to extend just the spa conduit without disturbing the existing junction box.

How many pool lights, spa lights and transformers?
 
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You might be able to drain the spa below the light and vacuum all of the water out of the conduit and then put sealant in the conduit at the junction box side to prevent water coming out.

This might not be acceptable to local code, so verify with an electrician to make sure that it is acceptable.

Just plan to relocate the spa junction box when the light needs to be replaced.

Maybe dig up the conduit and move the spa junction box higher and closer to the spa on the front wall to give additional slack.

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