If it is anything like the places that I have worked, lack of teamwork stems from the lack of management to treat the employees the same way making the employees bitter and unhappy. What usually needs to happen is a sit down with all supervisors and say we are starting over as of now. Let's face it, you have baby boomers that have been in the laboratory forever mixed in with younger people who can do the work at double the speed and they know it. The baby boomers are used to taking their time and working at their own pace and aren't very motivated to learn all of the new technology let alone how to do the maint., so they are more than willing to sit back and play dumb when it comes to these things. Not all of them, but it only takes a couple in each department to cause chaos. Everyone needs to be treated the same. Those new people know that the older people are making more money and find the whole thing to be unfair, and there are always the pot stirrers there to make ever worse. Someone has got to put there foot down and say that everyone will be treated the same and that things such as maintenance will be done by taking turns or by however you decide. You also cannot have people running into the supervisor or managers office tattling on each other, that cannot be tolerated. You are not running a daycare, this is a business. Basically, they have been allowed to act like children with their complaining and whining about shifts and each other and they need to know that this will no longer be tolerated. They need to know that you do care about them but they need to act like a team because they spend more time with each other than they do their own family and arguing with each other is pointless and doesn't get anything resolved. During the meeting ask them one by one if there is anything they would like to say, no matter how difficult it might be, it's their chance to speak out.