LR25 FLC BECAME DISTR WITH EQUIP PROB AND CLBED THROUGH ASSIGNED ALT. PIC ACKNOWLEDGED EQUIP PROB; BUT FO CLAIMS IT NEVER HAPPENED.

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CLBING TO FL230; FO COULD NOT SET UP LONG RANGE NAV #1. LOOKED DOWN TO SEE WHAT PROB WAS. WHEN I LOOKED BACK UP; I WAS AT FL235. THE ALT ALERTER WAS INOP. I CALLED MAINT AND WAS INFORMED THIS WAS AN INTERMITTENT PROB THAT THEY COULD NOT DUPLICATE OR REPAIR. IN THE FUTURE; I WILL TRY NOT TO LET UNNECESSARY PROBS DIVERT MY ATTN DURING CLBS AND DSCNTS. SUPPLEMENTAL INFO FROM ACN 426110: WE WERE CLRED TO CLB TO FL230 BY THE ZME CTLR. A FEW MINS LATER; ZME RADIOED US AND WANTED TO KNOW OF OUR ALT. I INFORMED ZME THAT WE WERE LEVEL AT FL230. THE ZME CTLR CALLED BACK AND STATED THAT HE SHOWED OUR ALT TO BE FL238. I IMMEDIATELY CALLED THE ZME CTLR AND INFORMED HIM THAT WE WERE AT FL230. AT THAT POINT; THE ZME CTLR NEVER QUESTIONED OUR ALT AND THEN HANDED US OFF TO THE NEXT CTLR. AS FAR AS THE CREW IS CONCERNED; WE TOOK EVERY STEP TO ENSURE OUR ACCURACY OF ALL SITS. REGARDLESS OF WHETHER THERE IS A POSSIBILITY OF EQUIP MALFUNCTION (EVEN THOUGH ALL SYS WERE WORKING); IT IS IMPORTANT TO ALWAYS CHK AND DOUBLECHK ALL AREAS OF FLT. THE IMPORTANCE OF CRM CANNOT BE OVEREMPHASIZED.