I think those pink pads are thermal compound to transfer heat to the cover. Those are probably transformers that are running hot and dissipating odor. You might want to put some conductive grease, the white stuff, on those where they meet the cover.
I had an IBM PS2 computer that had a failing power supply. It made an awful fishy smell that was either a transformer or capacitor heating up. I kept blaming some other more expensive HP equipment next to it because both were usually switched on.
The part values change with age and the switcher starts to run at a frequency or PWM that is outside the operating limits. Then stuff heats up and fails.
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