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Circuit Board for the 1992-1994 400 Systems, 1992 600-SUNCOAST® Systems, and 04/1996-04/1998 SUNTUB® DV/SV Systems. 6600-032. Replaced 6600-031. NOTE: Some 400 systems manufactured from 09/1994-12/1994 (except Montego) may have used the 6600-043 board which is no longer avaiable but can be retrofitted with the 6600-055 board.