What was found
(CAN) DURING COMPLETION OF AN I-CHECK AND AD2013-24-03, CRACKING IN VERTICAL STABILIZER. MAINTENANCE DISCOVERED THAT BOTH LT AND RT VERTICAL STABILIZER. SPAR CAPS WERE FOUND CRACKED AT UPPER HOLES. ALSO, BOTH HAT SECTIONS WERE ALSO CRACKED WHICH WILL BE MITIGATED WITH PART REPLACEMENT. ACFT HAS BEEN REMOVED FROM SERVICE AND THE OEM CONTACTED FOR FIELD REPAIR WITH RESPECT TO THE SPAR CAPS. SPAR CAP PN AFFECTED: 101-640011-3 &-4. HAT SECTION PN AFFECTED: 114-640000-25 & -26.