Hospital Won't Give Me Hospital Records

Hello, appreciate any input. We are in California.

My son has epilepsy. We had an inpatient stay at a hospital local to us for a 24 hr EEG. We're now switching our care to a larger children's hospital in our area and trying to get the records transferred to them. The hospital has been saying since March that some piece of equipment is broken and they can't get us a copy of my son's records. We are having trouble controlling his epilepsy and his neurologist wants to see his 24 hr EEG, otherwise they're going to make him do another one. The first one cost like $6,000 even after insurance. We can't afford to do another one. Do we have any legal recourse? Is there a time limit of a reasonable amount of time to wait for medical records before they're just withholding our records? Ideally, we don't want to actually have to sue but just give them a bit of an aggressive nudge to let them know they need to get whatever it is fixed and we're not backing down.