These posts make me cringe. This aluminum stem has asked to be retired. The OP should honor that request, spend $10-15 on a used stem and have his eyes open to replace that in the next couple of years with a stem he knows the history of. Aluminum doesn't last forever. Failures are usually sudden, often while JRA. Failure here will almost certainly involve real injury and $$ to the bike (fork and front wheel often do not do well when stems fail). For this stem., the first failure happened while not riding. Good! Now replace it! And enjoy riding with peace of mind.

Ben