The "L" blocks are held on to the sub sill by two screws passing through from the outside of the sub sill and screwing into the "L" block. You can look hard at photo and see their rusty little heads. The upper end of the "L" block has screws passing through it and screwing into outer edge of main sill. Neither of these two pair of screws can been seen, much less worked on, until the sheet metal under the door opening comes off.
John Oder
On edit - some more photos that may help.
JO
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