I might have found some clues from the BVSD "2013 CIPC - Security and Safety Sub Committee Report"; it sounds like Narrowbanding might have killed some or all of their campus radios. The report (clearly written by a top-notch radio tech) states as follows:
"District Wide Communication Systems – Digital transition: The district’s analogue radio communication system is outdated and doesn’t work in several areas of the district. Due to the age of the system, in addition to changes by the FCC in 2012 mandating that movement to digital systems, the ability to communicate at three levels has been greatly compromised:
1) Site specific communications – communicating with each other at schools.
2) District wide mass communications – communicating with schools or busses from the security office for notification of in progress or impending danger.
3) Interoperability with first responders – this is state law and our system currently prevents us from communicating effectively with first responders.
"The committee recommends an overhaul of the system and replacement of the analogue system with a digital communications system that would work in conjunction with our Internet infrastructure. This is necessary in order for BVSD to comply with current state law as well as for life safety implications surrounding site specific communications, district wide communications as well as adequate interoperability with first responders."
Does this suggest they had a large inventory of "pre-narrowband" VHF radios that had to be taken out of service in 2013? That would explain why all the BVSD repeaters seem to be dead. Hopefully they can get $20 million in grant funds to inter-connect with the "digital internet" system used by the Boulder County EOC...