Demand To Endorsers For Immediate Payment
The undersigned is the holder of the check # [#] to which you are an endorser.
Notice is hereby provided that said instrument has not been paid, and protest and demand is hereby made upon you to immediately pay the face amount of the instrument in the amount of $[dollar amount].
In the event payment is not made within five  days, the undersigned shall proceed to file suit on your warranties of endorsement.
Yours very truly,