Mystery diode "4L"

Any electronics whizzes recognise an axial diode slightly smaller than a 1N4001 bearing just the marking "4L" along with a blue cathode band? It's
used in a switch mode power supply of 1993 vintage running at around 25kHz. No other clues I'm afraid.
AWEM
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If you can say where it's used (input rectifier, output rectifier, etc) and the rating spec of the SMPSU, we can almost certainly give you a current part number to use as a replacement.
--
Andrew Gabriel
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