As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS SIDE LT BRAKES FEEL "SPONGY" HAVE TO BE PRESSED ALMOST TO THE FLOOR BEFORE ADEQUATE BRAKING IS ACHIEVED. OPERATED BRAKES SEVERAL TIMES AND TAXIED ACFT AROUND. FOUND PILOTS SIDE LEFT BRAKE TO BE FUNCTIONING CORRECTLY. BRAKES APPLIED EVENLY, PRESSURES WERE GOOD. NO DEFECTS NOTED AT THIS TIME. ALL WORK DONE IAW MM 32-40-51, OK FOR CONTINUED SERVICE. COULD NOT DUPLICATE.