Claim is submitted without prejudice to the Organization’s position that the violation involved constitutes a major dispute under the RLA. Claimant was assigned to the (Circ7 XE00) board from (MM/DD to MM/DD). Claimant was required to amass 276 service hours for the month of (July) tying up last at (1500 hours) on (MM/DD). Per the rest requirements contained in HOS, claimant was not rested to again work prior to (0001 hours) on (mm/dd). As a result of the HOS rest, Carrier improperly showed claimant in an unavailable status denying payment of extra board guarantee from (0100) on (MM/DD) to (2359) on (MM/DD). Claimant did not layoff, nor was otherwise unavailable for service, as defined by the GEB Agreement. Claimant earned ($3000.00). Please allow ($582.76) Difference in Payment.