So, go ahead, download it, and take some time to actually read it.
Regular maintenance likely involves an air filter on the projector, and odds are good that it is overdue for a serious cleaning. Make sure to be very careful when cleaning a projector.
If you get a good image from the projector, then hang onto it for a few more years. You may find that UHD projectors are finally on the market at a reasonable price. The 8700UB doesn't have 3D functionality, but delivers a high quality 2D image. Likely excellent for the room and space you are using it in, and since you just moved in and likely have low/no budget for upgrades, then this isn't the time to be spending a ton on a new projector.
You should check the lamp hours (in the menu) to see how many are on the current lamp. If the image looks poor, and very 'grey' instead of popping with color, then it may be about time for a new lamp. I know I left my old projector at my last house and it only had a couple hundred hours on the lamp and gave a great image that likely would look good for at least a year or two for the new home owners. So, you could have similar results.
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