Part numbers:
RM2-4696, RM2-4696-000, RM2-4696-000CN

Common error codes:
50.XX fuser errors
50.00 = Generic Fuser error
50.10 = Low Fuser temperature error
50.20 = Slow fuser error
50.30 = High fuser temperature error
50.70 = Fuser open error

Compatible Models:
LaserJet Pro 4001dn
LaserJet Pro 4001dne
LaserJet Pro 4001dw Wireless
LaserJet Pro 4001dwe Wireless
LaserJet Pro 4001n
LaserJet Pro 4001ne
LaserJet Pro MFP 4101fdn
LaserJet Pro MFP 4101fdne
LaserJet Pro MFP 4101fdw Wireless
LaserJet Pro MFP 4101fdwe Wireless