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Is it just the LAMP light flashing or are any others flashing?
Simply the lamp door switch OR the lamp switch itself isnt making contact, this code of the LAMP blinking will then appear, you havent mentioned the lamp door switch in your text so try this, as the lamp door closes it will activate a switch that audibly clicks into place, look carefully use a flashlight if necesary to examine the switch on the lamp socket itself or inside the lamp door
Please let me know how you go
The lamp door switch will be in a poition so that as the door closes it closes the switch look around the lamp door,I dont have a set near me so cant rem off hand, the lamp switch is in the base of the lamp holder you will need to examine closely you may have damaged either one