Its more likely that the front and rear mirrors need to be cleaned. The mirrors tend t get dull and that will cause the picture to become dull and the colors wont appear as vibrant as normal.
SOURCE: Newbie Question: How to replace the lamp in the lamp cartridge.
Try this, it includes a Youtube video
http://www.dlplampguide.com/915p020010.html
SOURCE: Mitsubishi WD 52525 lamp replaced, no picture, red light
You have to take the TV apart. Pull the electrical chassis out and look for bad electrolytic caps on the boards. The red LED probably means the 2 - 3300UF caps on the power supply board are bad. You can tell if they are bad by the fact that their tops are puffed up and they may or may not be leaking brown fluid. Compare them against the other caps on the boards and you will see how they have flat tops.
BUT before you take the TV apart you can check the error codes by pushing "menu" and "Device" at the same time and holding for about 10 seconds. The status light will blink two numbers. ex. one flash pause two flashes is 12 Error Code Probable Cause
12 No error detected
22 Recovery from momentary Reset
32 Lamp Cover open
33 Air Filter Cover open
34 Lamp abnormality
35 Chassis Fan failure
36 Exhaust (Back Cover) or Lamp Ballast Fan failure
37 Engine (DMD or Lamp) Fan failure
38 Excess Lamp Temperature
39 Excess DMD Temperature
41 Short Detected
44 DVI Cable (between Chassis and Engine) disconnected
or use this table - 
You can buy replacement caps from Mouser electronics online. There are plenty of solutions detailing how to do this already posted.
SOURCE: Buzzing noise from Mitsubishi DLP WD-52327 after replacing bulb
Did your replace lamp come on the screen or did you lose picture? Just because the LED indicator suggest replace lamp it doesn't mean it needs it. If your pix was dull or loss of brightness then replace it, if not then just reset your lamp timer, check your owners manual for instructions.
SOURCE: status lamp lights-up on front no picture
The lamp is not that exspensive you should be able to get one for around $150 and you can replace it yourself.
The lamp can be bought as a lamp or you can order the entire cartridge, I would suggest the cartridge, unless you are handy at taking things apart as the cartridge can be tricky to take apart without breaking it. The only difference will be the cost. It is your choice. The Mitsubishi part number is 915P020010
You can google this and find many places to purchase the lamp or cartridge on line.
Replacing the Lamp Cartridge Tool needed: Phillips screwdriver
1. Turn the television off and unplug the AC cord.
2. Remove the front speaker grill by gently pulling on each side. The grill will snap out.
3. Using a Phillips screwdriver, remove the three screws (one on the left and two on the right side) that hold the recessed plastic cover in place.
4. Remove the plastic cover and set aside with the screws.
5. After removing the cover, you will be able to see the lamp cartridge. With the screwdriver, loosen the threes crews of the cartridge. The three screws will not completely remove.
6. Gently grasp the metal handle and pull straight out (towardsyou).
7. Insert the new lamp cartridge securely into the TV. Do not touch the glass surface of the cartridge.
8. With the screwdriver, tighten the screws on the lamp cartridge.
9. Replace the plastic cover and screws.
10. Snap the speaker grill back into place by pushing it into place on each side with the palm of your hand.
I hope this information allows you to resolve this issue.
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SOURCE: Mitsubishi WD-65733 no picture, electrical buzzes in series
What it sound's like is that the lamp ballast is the problem. Buzzing sounds like when the power is first brought to the ballast it has to ramp up the voltage to get the lamp to light, then the voltage drops back down when the lamp is lit. Sounds like the lamp ballast isn't ramping up the voltage the way it should. May have to replace it. A good service shop would be able to do this for you.
Blessings,
A/V Media Guy
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