The Laney "A Little Agency" Model 18 is a fantastic acoustic amplifier—warm, feedback-resistant, and lightweight. The "sets33" error is frustrating but . If you have basic soldering skills, replacing the C68 capacitor and reseating the FX board will likely solve your problem for less than $5 in parts.
Under the doghouse, the original board was a work of English chaos: carbon comps drifted into new time zones, mustard caps leaking DC like a rusty faucet, and one output tube socket that had been re-soldered so many times it looked like a spiderweb in a hurricane.