Raid 5 Degraded - Not sure if data is recoverable

Hello Guys,

 I've got a Raid Degradation issue for my client's HP Ml 350g6 Server(Raid 5 WITH 5 disks 146GB 10K SAS, HP Model: EG0146FAWHU, HP P/N: 507119-003). since 2 of 5 disks are failed I couldn't rebuild array from storage controller to recover the data.

Not sure why 2 disk failed at same time. i've booted from USB pendrive with persistant windows and installed HP ACU tools & drivers. but still i'm getting the same message. Also, I've rebooted

I'm not sure if only RIS is lost(first few sectors corrupt ) or whole disk got failed. is there any way to check if the disk is consistent and data is recoverable? Please advice if you know of any troubleshooting steps to find if data is still there or not.

Thank you,

Dinesh Kadali