We performed a mechanical diagnostic and repair on a residential hot tub system in El Cajon. Our team accessed the interior plumbing cavity to service the circulation pump and integrated heating unit. We focused on identifying and resolving leaks within the complex PVC network and electrical control modules housed inside the insulated enclosure. To ensure long-term performance, we replaced several worn O-rings, gaskets, and threaded PVC union fittings. These specific components were critical to restoring a watertight seal and proper pressure within the filtration system. The project concluded with a full system test to verify that the spa returned to optimal heating and water circulation levels.