A: Maybe. Whether you have a case depends on the circumstances of the written lease, and the negotiations leading up to it, including whether payment of the pet deposit was conditional upon the Landlord's repairs to the property. Note that Colorado has codified the "warranty of habitability" which requires that the unit be habitable, and that the heating facilities be in good working order. (See C.R.S. 38-12-503). Most of the time, written notice to the landlord is required to invoke this statute, but these conditions must generally be met before the tenant moves in. You options under the statute may also be limited to moving out without payment of penalties. Good luck.
A: It depends on what your neighbor's written document provides and whether you consented to the installation. In almost all cases, the corporation must obtain a written easement to install a pipe across your property to convey water. The uses of the pipeline will be strictly limited to what is provided in the easement. Since this provides your neighbor with a pretty big benefit, it may be worth looking into this further or hiring an attorney. But given that the pipeline was installed 2.5 years ago, you should see a lawyer quick to avoid losing your claim per the statute of limitations, if you haven't already.