Solved during a text-only long-distance Acorn 180 curved stairlift tech support session

These are the problems encountered, and then solved, during a text-only, long-distance, Acorn 180 curved stairlift tech support session spanning three hours.  Client's cost was  a $75 per hour service charge by Rob's Repairs in Vancouver Canada, 604.512.9567.

Voltage battery pack balancing.

Establishing successful handshaking between batteries and motherboard that is unique to this early-model T565.

E4 errorcode.

Direction switch not responding.

U1 and J5 error codes.