Often, it's hard to determine which driver is the cause, but in the event that the drivers were damaged due to overpowering (yes, it's the most common cause of driver failure regardless of what "the internet" says), it's likely that all of the drivers share the same damage even if only one is identified as causing the noise.
On this era of cabinet, there was a transition from PAS drivers to Eminence drivers, but both shared a similar common mechanical limitation. There was very little difference between the small Xmax and Xlim. Xmax is the usable linear excursion and Xlim is the point at which damage occurred. The small Xmax was part of what was responsible for the classic SWR bright mid tone and high efficiency but as amps of all manufacturers evolved to higher power the shortcomings of this design became apparent. The Fender version of this driver was quite different, though still shared much of the tonal character of the original parts.
Visually, it's common to see a crease or a discontinuity at the point the cone bonds with the surround when the speaker has been driven to it's Xlim. If this is the case (post pictures, we may be able to identify) than the only practical solution is to replace the drivers. The original parts are no longer available for either driver version.
