TM 10-3930-669-20 VERIFY REPAIR (1)   Set     MAIN     POWER     switch     to     ON position (TM 10-3930-669-10). (2)   Set cab lights switch to ON position (TM 10-3930-669-10). (3)   Observe light. (a)   If cab lights do not operate, fault not corrected.    Perform  Steps  (4)  and (5)  below.    Repeat  procedure  and notify Supervisor. (4) Set cab lights switch to OFF position. (5)    Set    MAIN    POWER    switch    to    OFF position. 2-131