Cut them, spray with some insecticidal soap, hope you don't have mites too badly and get them outside as soon as you can. You shouldn't have a problem with the pruning as they are in a controlled temp environment. If you suspect mites (a likely source of browning, dropping leaves), turn the plants on their side daily and spray the undersides of the leaves with the sprayer from your sink or a squirt bottle with water. The mites don't like it wet and this will get rid of them better than anything except a miticide which can be really expensive.

Suz