What was found
ELEVATOR TRIM FROZE INFLIGHT AT 26,000 FT. DID NOT UNFREEZE UNTIL 10,000 FT. AIRCRAFT WAS CONTROLLABLE BY NORMAL CONTROL PRESSURES. REMOVED AND REPLACED LT AND RT ELEVATOR TRIM TAB ACTUATORS IAW MM 27-32-02. ADJUSTED TRIM TAB CABLE TENSIONS IAW MM 27-00-01. CHECKS GOOD. LT S/N ON: 756 P/N OFF: 5299, S/N OFF: 696, RT S/N ON: 175, P/N OFF: 5299, S/N OFF: 697.