As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE WHEEL STEERING CHANNEL CRACKED AT RIGHT REAR WELD. MADE POPPING NOISE WHILE TAXING. DUE TO STEERING AIRCRAFT ON GROUND, NOSE WHEEL STEERING (WHERE BALL GOES INTO SAID CHANNEL) STRESSES THE WELDS ON FORWARD AND AFT ENDS THUS CRACKING THE WELDS.