HP 48G Repair

[Tupelo Rod]

Hi. I just registered tonight and this is my first post. I have an HP48G I bought new around 1994. It looks like it won't come on anymore even though I have replaced the batteries and attempted a reset. The reset did work but some buttons were unresponsive. That was a week ago. Now, it won't come on at all. Does anyone know a trustworthy source I could send to have it repaired? I am located in the southeast and would love to find someone I could drive to and leave it with them then pick it up (I know, might be a stretch). I travel 3-1/2 states for work. Thanks in advance.