TERRY DITLER, Petitioner, v. WORKERS' COMPENSATION APPEALS BOARD, SAN JUAN UNIFIED SCHOOL DISTRICT et al. , Respondents. Ditler contends that the Workers' Compensation Appeals Board erred in apportioning 50 percent of his overall disability to preexisting nonindustrial causes. On October 3, 1977, Ditler filed an application for adjudication of claim before the Workers' Compensation Appeals Board. But, because of the intervention of job problems this was up--the pattern was upset . . . . ' Dr. Groesbeck opined that Ditler was carrying a partial permanent disability. These facts do not constitute substantial evidence that Ditler suffered from a 'labor disabling' preexisting disability.

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