Wilson - you describe my problem EXACTLY! Mine happens more frequently when I turn to the right. It always happens to the right when I get aggressive, and "might" happen in both drections from time to time. In either case, I hear the "pop" and 1-2 sec's later, I get the message. I plan to dig in and inspect - with all the info you provided, I wouldn't doubt if I can fix it. It might not even take any parts - simply remove, disassemble, clean, re-assemble and try it. Hard to believe an aluminum block is actually "broken". Any tips on bleeding the system?
Thanks and a handshake!