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Hello, Sorry you're having problems. The red light does indeed indicate that the Lamp has failed and this is very common if you replaced the lamp using a $30 Amazon or Pureglare lamp. Did you use one of those or the $110 OEM Osram (recommended by Mitsubishi) replacement?
Also, if you're unsure if something done inside of the set may have caused this (it's impossible for me to know if the lamp was bumped, a connector was pushed out of place, is loose, or if simply the vibration of removing the back of the set was enough to cause the lamp to leak it's internal gas), then I would first remove the back of the set and double check all of the work- including removing and re-seating all connections touched during the process. If the red light still comes on after checking your connections, then your lamp indeed needs to be replaced.
The correct OEM lamp is available at the link below. We very commonly see the lesser priced lamps sometimes only last a year, a month or even a couple of days:
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