You can find lot of information for 465.
But please, follow only these guys who know what they do.
This is one example.
Cleaning the Volts/Div Attenuator Switch Contacts in Tektronix 4XX OscilloscopesThis is not propably best but just try find this kind of info.
Also use original Tek 465 service manual.
(many things depend also what version 465 you have.)
Never ever put any kind of lubricating (oil) liquids to these contacts becouse after then all collected dust stay there and inhibit good contact) I mean contact surfaces. All contacs there are serviceable. (mostly after service/overhaul they work as new)
Pure Isopropyl is just right. (also some other can use. Never ever try ethanol or methanol or some other "destroy" liquids for any use with these) Some good quality dry video cleaner is also ok, and in some places good quality "deoxit".
Then careful if your model is with unsoldered semiconductors assembled with socket. Some times they may drop. Do not turn any internal adjustement until know procedure. Adjuxstment is described in service manual and there is also interactions between adjustments - some adjustments need do with right order. Some adjustments need special test equipments.
465 can use and adjust without external service fan when case is open. (most of 2400 need external fan - if want avoid hybrids damage.)