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When a demand amounts to a statement of intention not to perform except on conditions which go beyond the contract, it becomes a repudiation. See Miran Investment Co. v. Medical West Bldg. Corp., 414 S.W.2d 297, 302-03 (Mo. 1967) (refusal to perform except on execution of personal guarantee not required under contract held a repudiation). See also Pittsburgh-Des Moines Steel Co. v. Brookhaven Manor Water Co., 532 F.2d 572 (7th Cir. 1976) (applying Illinois law) (refusal to perform except on execution of personal guarantee or escrowing of payment not required under contract held a repudiation); Westinghouse Elec. Corp. v. CX Processing ...