What was found
DURING FLIGHT, OVERHEAD BIN DOOR BEGAN TO BUBBLE & DELAMINATE. THE DELAMINATION CAUSED A CRACKING NOISE THAT WAS CONCERNING TO CREW. THE FLIGHT DECLARED AN EMER & RETURNED WITHOUT FURTHER INCIDENT. DRILLED A HOLE IN THE DOOR TO PREVENT DOOR FROM BUBBLING UP AGAIN. ITEM WAS PLACED ON PLACARD. THE ACFT GNDED. CLEANED & INSPECTED FURTHER, NO DELAMINATION FOUND. SECURED LOOSE OPERATING ARMS IAW AMM 25-280910401. OPERATIONS NOW NORMAL.