Panasonic FP-355 E05-14

First it reads it is E3-22 Exhaust fan problem possibly.
Panasonic FP 7713 User Manual Panasonic FP 7713 User Manual

Here is the manual

Do you have can air remove covers exit side of machine, clean vents and remove dust from fans!. If you can remove the fans to clean them better then blowing dust into the machine!!!

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Laser unit. You can try re seating the connectors on the laser unit.

the polygon motor will be dirty

Hello sir; that's density senser problem, replace it !

clean sensor beside drum then switch on machine with white paper on glass.

E 1- 41 Optics fan B not working

Hello sir; E01-22 that's laser motor synchronization, need to replace laser unit the item# is FFPGC0208

E3 - 01

That could be a few things. Your corona wires might need replacing. Something with the middle transport section, where one of the corona assemblies is at, is not making contact properly. Or it could be the high voltage power supply.