What was found
"HYD 3 ELEV OFF" ALERT CAME ON. WE NOTICED HYD 3 QUANTITY SLOWLY DECLINE. WE LATER HAD HYD QUANTITY LOW. WE EXTENDED THE LANDING GEAR NORMALLY. WE THEN HAD HYD 3 FAIL. AFTER BLOCK IN FOUND HYDRAULIC QTY NR 3 SYSTEM AT 3.5 GAL. FOUND HYD LINE CRACKED AT TEE FITTING MPN. AJK7022-509, UPPER HYD. LINE AT HORIZONTAL STAB UPPER PRIMARY CONTROL VALVE. REMOVED AND REPLACED BROKEN HYD LINE, PER 20-10-01-2. SERVICED NR 3 HYD SYSTEM, PER MM 12-13-02-3. LEAK AND OPERATIONS CHECKS NORMAL. OK TO CONTINUE.