Does any one have any recommendations on an A/C repairman? It is on a Maxum 2400 SCR. I need mind to be looked at before it starts getting warmer temps. It doesn't stay cold for more than an hour or so. Seems water discharge isn't what it should be, but nothing is stuck, I may need a new pump or to have it charged. Can it be charged. I think it is an AirTemp. Any advice would be appreciated. Thanks.