TM 9-2320-209-20-3-1 b. Cleaning, Inspection, and Repair. WARNING Dry cleaning solvent is flammable. Do not use near an open flame. Keep a fire extinguisher nearby when solvent is used. Use only in well– ventilated places. Failure to do this may result in injury to personnel and damage to equipment. (1) Using clean rag dampened with solvent, clean light door and sealed beam unit. (2) Check light door for dents, cracks or other damage. Check sealed beam unit for cracks in glass, burned out filament, and corroded contacts. If contacts are corroded, using cent act cleaner, clean them. (3) Check screws for damaged threads. (4) Throw away damaged parts and get new ones in their place. c. Replacement. FRAME 1 1. Put sealed beam (1) into light door (2). Aline tab on sealed beam (1) with slot on light door (2). WARNING Cover retaining springs (3) with free hand when putting them in. Retaining springs may snap out and cause injury to personnel. 2. Using screwdriver, put in four evenly spaced retaining springs (3). Put square bend of spring over sealed beam (1) and push free ends under flange of light door (2). GO TO FRAME 2 7-156