As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: LOSS OF SYSTEM "A" HYDRAULIC FLUID DURING FLIGHT. CORRECTIVE ACTION: DURING WALK AROUND FOUND #1 BRAKE SUPPLY LINE WITH A LEAK. REMOVED AND REPLACED HYDRAULIC SUPPLY LINE AS PER B737 AMM 20-10-52. SERVICED SYS "A" PER B737 AMM 12-12-00. ACCOMPLISHED OPS TEST OF HYD SYSTEM "A" AND "B" AS PER AMM 29-15-00. OPS AND LEAK OKAY. IPC REFERENCE 32-41-00/15 ITEM 190.