As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCEPTANCE INSPECTION ON NEW GROB AIRCRAFT WITH 72.2 HOURS SINCE NEW, FOUND INDUCTION AIR BOX CRACKED IN NUMEROUS LOCATIONS. LT AND RT FWD SIDES CRACKED, TOP L SIDE DOUBLER FWD OF CARBURETOR ADAPTOR CRACKED. CRACKS ARE ATTRIBUTED TO PROPELLER/ENGINE VIBRATION. BOTH ENGINE AND PROPELLER HAVE 72.2 HOURS SINCE NEW. DYNAMIC BALANCE TO BE ACCOMPLISHED TO REMEDY CRACKING.