What was found
L/H SLAT TRACK SUPPORT ROLLERS 3EA AND RUBBING BLOCK 1EA HAVE FLAT SPOTS AT LOCATIONS 1-1 OTBD FWD, 1-2 OTBD AFT, 1-2 INBD FWD AND 2-2 OTBD AFT (C-CHECK RO 9-21-21) REMOVED AND INSTALLED NEW SERVICEABLE LH SLAT 1-2 O/B AFT, I/B FWD, AND 2-2 O/B AFT SLAT SUPPORT ROLLERS. REF CRJ700 AMM 27-81-44-400-801-A01 AND CRJ700 AMM 27-81-44-400-802-A01. OPERATIONAL TEST GOOD.