A costly hardware mistake, check minute 15:30, seems that all 4 bolts and nuts were installed backwards, became loose and motor dived into the deep blue...thoughts..
https://www.youtube.com/watch?v=42a5ZX3d5FU&lc=z22zslo5oxflfl5usacdp43bplr5ftskcjfzfe2ns1xw03c010c.1554900516374080
Sad Boating..