Hi,
if someone can help recognize:

may be someone have code book for this diodes?

 

From Wikipedia:

MELF is the acronym for metal electrode leadless face - a type of leadless cylindrical electronic surface mount device that is metallized at its ends. MELF devices are usually diodes and resistors.

Perhaps you can tell us a bit more about the board and what unit it is from.
A photo that shows a wider view of the board would help.

 

Whole board from Lenze VFD

part of this board with diode

 

Why do you suspect the diode needs replacing?

 

check with tracker, do not see any signature up to 50 volt.
check with multimeter as diode and have 1.93 in both directions.
i do not think its a tvs higher than 50 volt on this board.
all other same melf diodes have green or grey color band and i see diode signature on tracker and multimeter voltage in one direction 0.61 volt

 

If memory serves its an 8.2V zener, im pretty sure the 3 stages are identical and a good one from another stage can be used to check, ive also had a ot of issues with the pulse transformers going faulty