What was found
AFTER TAKE OFF AT 2500 FT, DOOR ENTRY L1 EICAS MESSAGE. ACFT PRESSURIZING NORMALLY. 2 VERY LOUD BANGS, SHOOK FLIGHT DECK DOOR. FOUND L1 DOOR UPPER FWD & AFT CRANK ROLLER CAM ASSY BROKEN. CRANK ROLLER CAM ASSY REPLACED. L1 DOOR FUNCTION CHK GOOD IAW AMM 52-11-19. L1 DOOR INSTALLED AFTER REPAIRS IAW AMM 52-11-01. NDT INSPECTION C/W & FOUND ONE CRACK AT 1ST LAYER RUNNING 10 O'CLOCK THRU THICKNESS. ONE CRACK FOUND AT 2ND LAYER RUNNING 5 O'CLOCK APPROX 0.040" IN DEPTH. L1 DOOR INTERIOR LINING INSTALLED & SIDEWALL PANELS INSTALLED IAW AMM 25-21-00. SUBJECT AREA PERMANENT REPAIR CARRIED OUT REV NRC = NN445MC000100, EA-4453A0117 REV 0 AND EA-4453A0118 REV 0 ACCOMPLISHED.