Thank you, Russ, that was quick work. I've been able to fix three of the four games affected by the mishap.
Two problems:
(1)
Game 3638384
My first try at using the "gamefix" URL for this game jumped me to the RHP home page instead, and my second and later tries say:
"Game 3638384 cannot be fixed
This game has a complete history, but it is corrupt and now cannot be fixed."
The game history is
not complete. The "game log" popup shows that the most recent move, 11 ... Nc6 x d4, is missing.
I don't think Tequila tried to fix it, because he last moved eight hours ago and is probably offline now.
(2)
Game 3122675
The "Game History" page says the game has no history, yet the "game log" popup has all the data. This game finished last February.
Is it possible that valid game history is being misidentified as corrupt?