What was found
PILOT REPORTED RT BLEED AIR LINE FAIL ANNUNCIATOR CAME ON, CLIMBING THROUGH FL 260. INVESTIGATED AND TROUBLESHOT IAW MM 26-11-00. FOUND SMALL HOLE IN BLEED AIR WARNING EVA TUBING IN FORWARD RT CABIN UNDERFLOOR AREA. NO BLEED AIR LEAKS NOTED ADJACENT TO AREA DURING ENGINE GROUND RUNS. TUBING NOT CHAFED ON ADJACENT STRUCTURE OR COMPONENTS. SPLICE-REPAIRED TUBING IAW MM AND RETURNED TO SERVICE. POSSIBLE TUBING MFG DEFECT, SECOND SIMILAR OCCURRENCE NOTED IN LATE MODEL AIRCRAFT.