Antiquated French drain system broke around home, is interior french drain my only option? (Please read all details.)

Recently had minor flooding in the basement and had two techs out to figure out what might be going on. It was found that the sump pump pit has been bone dry from water not entering it from the pipes making up an antiquated pseudo-french drain around the home. They weren't able to scope the entire pipe due to a small hole at the bend so it's hard to know where the pipe actually is around the home. From what they could scope, it was found that there are a couple of small holes in these terra cotta pipes at two of the bends, and they had been backed up with sand and debris (now hydroflushed as much as it could). So it looks like the water has been spilling out of the pipes/can't flow through properly and coming in around the foundation rather than directed to the sump pump. Ideally, I want the pipes repaired but they seem to run under a patio in the back and a sunroom on the side and everyone has been telling me these would have to be ripped up to do the repair so it's likely not possible.

With this info, it's been hard to get a full diagnosis and know how to proceed. Everyone keeps pushing an interior french drain system on me and I really don't want to have to do this unless it is my absolute last resort. So I have a couple of questions, wondering if anyone has any insight:

• Can a small hole really prevent a scoping from being completed? Is pursuing this a lost cause? I really wanted the whole pipe scoped to know what's going on.
• Does a repair also seem impossible? There's not a clear idea of where the pipe is so I am not sure if it could be done from inside instead of ripping up these spaces above.
• Does an interior french drain seem like the only solution? After reading this, could you see any other option or area for further diagnosis?

Any help greatly appreciated!