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SpaGuts Replacement board for the 52531 or 52531HC1 Balboa control system. This circuit board is compatible with the 54135 Balboa Topside, 51225 Balboa Topside, 54251 Balboa Topside, 54094 Balboa Topside, the 32016 Balboa M7 Sensors, 58010 Heater Assembly, and the 30511 Copper Straps. Chip SUVR1. OEM part number 52532-02. This circuit board is also a replacement option for the following part numbers: 52947 (Chip POLSUV), 52645 (Chip STD05), 52616 (MUST replace with new compatible topside panel), 52711 (Chip 137 SUV - MUST replace with new compatible topside panel), 52709-02 (Chip 135R1 SUV - MUST replace with new compatible topside panel), 52708-02 (Control System - Chip 135R1 SUV - MUST replace with new compatible topside panel), 53335 (Chip FREE20 SUV - MUST replace with new compatible topside panel), 52641 (Control System MAS260 - Only use if there is no circ pump), 53516 (Chip MAS260 - Only use if there is no circ pump), 52903 (Chip PHX05 - Only use if there is no stereo), 52940 (Only use if there is no stereo), 59-138-1037, 3-60-0030, 52917. Circuit board dimension (approx): 9" L x 5.25" W. This item comes with a 1-year limited warranty.