Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Type 1635
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem; General Maintenance Action
Procedure
Approaching FAF for the ILS; FO (First Officer) is PF (Pilot Flying); intercom phone rang repeatedly. Captain picked up and [a flight attendant] answers asking if we're close to landing. Captain explains yes; with landing gear about to be deployed (!). [Flight Attendant] frantically states the Seatbelt Sign is not on and she needs to rush to get things completed. Captain tried sign and [the Flight Attendant] confirms no sign and no chime. No chime was heard while climbing through/descending 10;000 feet either; though this isn't always audible in the Flight Station and nothing was commented to pilots otherwise. Seat belt sign (along with PA) was used for turbulence once during transit; but again; nothing conveyed to forward crew. On taxi in and while inspecting circuit breakers; Captain found Seat Belt and Lavatory Smoke breakers out. Captain preflighted all breakers before doing external walk around; with everything secured at that time. While he was outside; a new flight bag with current Jeppesen changes was installed by his seat; with the FO present during this. He now believes that in their haste to install it; they must have knocked the breakers loose (breaking the head off the Seat Belt one). Fixed and worked properly [by Maintenance personnel].
B737 Captain reported two circuit breakers were damaged after maintenance work in the cockpit.