In my experience, a "few blown capacitors" will be just the tip of the iceberg. Electrolytic capacitors blow for only a few reasons:
1. Installed backwards
2. Incorrect voltage rating for the circuit
3. Extreme age (10-20 years), they dry out then next time voltage applied; they bite the biggun.
4. They are taken out by a "fire" elsewhere in the circuit.
Doubt it's 1 or 2 (since Lenbrook took over NAD, quality has improved across the board) with the recent build of that amp, no way it's #3.
IF this "project" (how you must approach it; a learning experience) is selling for more than $40, walk away, if it is really smoked inside, it may get repaired, but future reliability is questionable.