What was found
ON APPROACH, LT SIDE BRAKE PRESURE GAGE READS 500 LBS. RIGHT SIDE 0 LBS. DECLARED EMERGENCY IN CASE LT BRAKE WAS STICKING. LT YELLOW SYSTEM BRAKE PRESURE INDICATOR. PARKING BRAKE ACCUM LOW, WHILE ATEMPTING TO SERVICE FLUID WAS COMING OUT OF SERVICE PORT. FOUND LOW PRESSURE AT YELLOW SYS BRAKE ACCUMULATOR INDICATOR. OPENED SERVICE VALVE, FOUND HYDRAULIC FLUID ON NITROGEN SIDE OF ACCUMULATOR. R&R UPPER & LOWER YELLOW BRAKE SYS ACCUMULATOERS IAW AMM 32-44-11-04 AND PERFORMED SAT OPS CHK & LEAK CHK. PERFORMED ALT BRAKING W/ANTISKID SERVICING IAW AMM 32-43-00-03-0. REQUIRES FURTHER TROUBLESHOOTING PER MOCC. PER MOCC NORMAL BRAKING. ADJUSTMENT/TEST PERFORMED AND OPS CK NORMAL PER AMM 32-42-00-05.