If the mods feel this is inappropriate for the forum, I'll understand a lock or delete.
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Edited by Tech2 - 10/28/13 at 6:57am
It does indeed look like a 250ohm coarse adjustment (single turn) pot.
Its hard to say if its burned or just dirty from the picture. Hooking it up to a resistance meter should tell you immediately if it is damaged.
Can he find a schematic for whatever this is? Can he make a reasonable guess (or measure&calculate) how much power this part will dissipate? It should not cost too much to replace it, however much power that is.