2006/2007/2008/2009 Caldera Cumberland and Hot Spot Sorrento is indicated by the letter in the serial number. for example. Serial Number  CUH SOR-3H2015 the serial number would read CUH SOR is model  3 third quarter L year(2006) and 2015 is the unit number made. Serial Number  CUH SOR-3J2015 the serial number would read CUH SOR is model  3 third quarter M year(2007) and 2015 is the unit number made. Serial Number  CUH SOR-3K2015 the serial number would read CUH SOR is model  3 third quarter N year(2008) and 2015 is the unit number made. Serial Number  CUH SOR-3L2015 the serial number would read CUH SOR is model  3 third quarter N year(2009) and 2015 is the unit number made ..
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