Glad it was a straightforward repair! Those no F, no M STs were never all that common (at least here in the UK) and are getting harder to find with each year.
Nice little TOS 1.4 upgrade there too -- a great quality-of-life upgrade for those early machines. If I had one, I'd love a switchable TOS 1.0/1.4. That 'please insert disk' screen of 1.0 is a novelty even to those of us who grew up with the ST.
Only problem is... now I want one!