SLIPPED WHILE CLIMBING ON MAINT.TRUCK, DANGLED BY RT. ARM. NO IMMEDIATE CAUSE FOR CONCERN, PROGRESSED OVER SEVERAL DAYS TO SORENESS & STIFFNESS. REPORTED INCIDENT ON 7/26/04 & RESPONDED WELL TO COMFORT MEASURES. EXACERBATION OF SYMPTOMS CAUSED CALL OFF ON 7/29 & 30TH. SENT FOR EVAL. RESULTING IN OFF WORK DAYS (10 DAYS), WITH FURTHER WORK UP TO RULE OUT HERN. DISK.