What was found
DURING CLIMB, RECEIVED ADC 2 FAIL MESSAGE. FLIGHT RETURNED TO CLT. NO EMERGENCY DECLARED. FLIGHT LANDED ON RWY 18R AND RETURNED TO GATE 31 WITHOUT FURTHER INCIDENT. PERFORMED BIT TEST OF ADC2, IAW CRJ-700 AMM 34-13-01-740-801, TEST GOOD. FOUND S2 DRAIN ASSEMBLY ON DRAIN MANIFOLD TO BE CRACKED AND CAUSING A LEAK. REMOVED AND REPLACED S2 DRAIN, IAW CRJ-700 AMM 34-11-15-000/400-801. PERFORMED FUNCTIONAL CHECK OF PITOT STATIC SYSTEM, IAW CRJ-700 AMM 34-11-00-720-801. CHECK GOOD. NO IAS/ALT FLAGS OR EFIS COMP MON.