[sdiy] OT: Whining Transformer

[Steve Begin]

My computer's power supply has started making a high pitched whining noise, and I opened it up and tried to isolate the sound and it _seems_ to be coming from a transformer, but it's very hard to pinpoint the source of the sound, even when holding a cardboard tube up to my ear.

Is it most likely coming from the transformer?  If so, will replacing the transformer help?  If so, do these numbers mean anything to anyone? (they were on the transformer but if it's a part number I can't seem to find the part anywhere).
LT070-3
RC 0303
HI-POT

Any advice would be appreciated.  I can't stand high pitched whiny noises unless they diguised as music.

-Steve
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