What was found
POST FLT CREW REPORTED VERY LOUD BANG AT V1 & RUBBER ODOR. ACFT GROUNDED FOR INSPS & MAINT. WITH LT & RT ENGS ENGAGED IN IDLE RUN IAW AMM 71-00-00, NO FAULTS FOUND OR ODORS NOTED WHEN ISOLATING BLEEDS FOR LT & RT ENGS. LT & RT PACKS OPS CHK GOOD. ENG PARAMETERS WITHIN LIMITS. NO FAULTS FOUND. VISUAL INSPECT OF MLG & COMPONENTS GOOD IAW AMM 32-05-03. LT & RT PACKS BUILT IN TEST EQUIPMENT CHECK GOOD IAW AMM 21-61-03. NO FAULTS. ANTI-SKID/AUTOBRAKE SYS TEST IAW AMM 32-42-00 GOOD. INSPECTS FOR SMOKE FUMES IN COCKPIT IAW AMM 05-51-56 GOOD. NO FAULTS. MANUAL ACFT PRESSURIZATION UP TO 1 PSI TO VERIFY OPS OF OUTFLOW VALVE GOOD IAW AMM 21-31-00. DURING COURSE OF FAULT ISOLATION, MAINT REPORTED NLG RETRACT ACTUATOR & STEERING CONTROL VALVE DISPLAY EVIDENCE OF HYD LEAKS. NLG RETRACT ACTUATOR VALVE & NLG HYD SWIVEL JOINT R & R. OPS & LEAK CHKS GOOD. NLG STRUT REPACKED. VISUAL INSPECT OF INTERNAL COMPONENTS GOOD. NO FAULTS. FUNCTIONAL FLT CHK GOOD. NO FAULTS. ACFT RELEASED TO SERVICE.